No. Replacing the bezel would be prohibitively expensive as the blue sapphire glass is permanently bonded to the bezel and the AMOLED screen. If you're looking for ways to personalize your Teric, you can purchase coloured watch straps.
FAQ
Choose your product below, and then search in the box below that to find your answers.
How to Calibrate:
- Find magnetic north using a compass
- Find compass setting in Teric
- (menu > settings > compass)
- Calibrate and confirm
- Rotate Teric on all three axis TOWARDS magnetic north -
- forward, sideways, and on edge
- Continue rotating the Teric in random directions for remaining calibration time
- Check the Teric against the compass
How to install:
- After washing your hands. pre-position the screen protector to the Teric (adhesive side downward).
- Clean the screen of your Teric with wet wipes followed by the dry wipes. then clear the remaining liquid with the microfiber cloth.
- Clean the dust on the screen with the dust absorber sticker.
- Peel off the protective film from the PET screen protector.
- Press the center of the PET screen protector and remove the tiny air bubbles by gently pushing outwards with the squeegee from the center (Allow 1 - 2 days for the smaller bubbles to fully disappear).
IMPORTANT NOTE:
- Must clean the dust on the screen and apply it in a dust free room.
- Air bubbles will automatically disappear within 24 hours.
- If there are air bubble spots. the section is not adhering, and you will need to gently peel off the screen protector carefully and reinstall it.
A Cautions:
Repeated removal of the PET screen protector may cause it to lose its adhesiveness. During application. excessive force may cause damage to the PET screen protector.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
The Teric screen is made of sapphire crystal which is one of the most scratch resistant material that can reasonably be used as a watch window. However, sharp impacts can still result in scratches. In particular, chrome plating has very high hardness and may scratch the Teric window. If you are concerned with scratching the Teric window, we suggest using a screen protector. Exceptional impacts may still damage the window even with a protector fitted. Screen protectors are currently sold by several third-party vendors that fit the Teric.
Shearwater recommends service of your dive computer every 2 years by an authorized service centre.
Yes, we will replace the charger under warranty. In the meantime, there are a number of third-party wireless chargers that will work in a pinch.
The best charger we tested so far was the Choetech model (CHOETECH Wireless Charger, Qi Certified T511), and it is quite inexpensive. You can pair this (or the charger included with the Teric) with any portable power pack with a USB output port. The Teric battery is 560mAhr. I would derate a power pack down to about 40% of its capacity due to efficiency losses. Most portable power packs are at least 10,000mAhr (e.g Anker PowerCore 10000). So, (10000 * 0.4) / 560 = 7 charges. At 30 hours (minimum) per charge, this is at least 210 hours of portable operation.
The typical battery life is 5 years.
The battery can be replaced at authorized service centers. The cost of replacement is part of our General Maintenance at $150 + shipping.
The turn around time for replacement is 5 business days after receipt of payment, excluding shipping time. The battery replacement includes inspection, functional testing and pressure testing.
If the battery is not meeting performance specifications within the 2-year warranty period it will be replaced free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Try taking the battery out and leaving it out for at least 5 minutes. This should allow the transmitter to reset, and often solves a loss of communications.
For full instructions with pictures explaining the best way to remove and replace the O-ring, please click HERE
We are sorry that you are having a problem with your dive computer that can't be resolved with our FAQ’s. If your dive computer needs some kind of repair, simply email us at info@shearwater.com to initiate the process.
Please include your name, address and phone number, description of your problem, unit model, S/N and Firmware Version. We’ll get you an RMA number and instructions on how to send your computer in for repair. Please do not return your computer to us or any of our service centers without an RMA number.
To find your S/N and firmware, turn on your computer (unless it won’t turn on) and from the main screen press the right side button 8-10 times until you see the S/N displayed (lower left) and Firmware (lower right) of the screen.
The standard transmitters all use the same transmit interval, so there is a small chance they may interfere with one another when using two or more at the same time with one Perdix AI. One way to resolve this is to shut off the air to one transmitter (purge pressure to 0) for at least 2 minutes, then restore the pressure. This may be done underwater, of course choosing to shut off the source not being used for breathing at the time. An alternate solution is also available by using a different transmit interval device for the second transmitter. Compatible transmitters (FCC ID: MH8A) with different transmit intervals are available – look for colour coded units (green or yellow are both different from the standard units). Yellow transmitters are also available through Shearwater. Standard units are identified by the black or grey case.
While almost any kind of AA battery will work with your Shearwater Perdix, 1.5V lithium batteries like the Energizer Ultimate Lithium work best. This battery type performs well in a wide temperature range and is much less likely to leak and cause damage to your dive computer.
Read more here: https://www.energizer.com/about-batteries/battery-leakage
Depth is not measured directly. Dive computers measure pressure, and convert this to depth based on an assumed density of water.
Water density varies by type. The weight of salts dissolved in saltwater make it heavier than freshwater. If two dive computers are using different densities of water, then their displayed depths will differ.
The water type can be adjusted on the Perdix. In the System Setup->Mode Setup menu, the Salinity setting can be set to Fresh, EN13319, or Salt.
The EN13319 (European CE standard for dive computers) value is between fresh and salt and is the Perdix default value. The EN13319 value corresponds to a 10m increase in depth for pressure increase of 1 bar.
The density value used for each setting is:
- Fresh Water = 1000kg/m³
- EN13319 = 1020 kg/m³
- Salt Water = 1030 kg/m³
In Gauge Mode the Perdix does not know what gas you are breathing and therefore cannot track the inert gas tissue loading.
- The Shearwater Perdix should be stored in a clean, cool and dry environment.
- Do not allow salt deposits to build up on your dive computer. Wash your computer with freshwater to remove salt and other contaminants.
- Do not use detergents or other cleaning chemicals as they may damage the Perdix dive computer.
- Allow to dry naturally before storing.
- Do not wash with high pressure water as it may damage the depth sensor.
- Store the Shearwater Perdix out of direct sunlight in a cool, dry and dust free environment. Avoid exposure to direct ultra-violet radiation and radiant heat.
- Do not store batteries in the Perdix for long periods (several months). Batteries can and do leak, so don’t risk your expensive computer on a simple task like removing batteries. Dead batteries are at a higher risk of leaking.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
Yes, to unlock dive log recovery, go to “Dive Log->Edit Log Number” and set this to “9997”.
Now the “Clear Logs” menu option will be changed to “Restore Logs”. This will restore all deleted logs. To restore individually, go to the “Dive Log->Display Logs” page. Deleted logs will be grayed-out. Select the dive to restore, then press the right button until the “Edit Dive” menu comes up. This will have a restore option.
Remember to go back to “Edit Log Number” and set it back to its previous value. The next dive # will be the number entered here plus one (e.g. If 2 is entered, the next dive will be dive #3).
Yes, all settings and dive logs are saved in permanent (non-volatile) memory and restored after the battery is changed.
To reset the settings to defaults, use the “System Setup->Reset to Defaults” menu. You can choose to reset the settings, the deco tissues, or both.
When the battery is removed the clock stops running. Upon installation of the battery, the clock is loaded to the last saved value (saved every 16 seconds when on, and every 5 minutes when off).
The Perdix uses a highly accurate quartz crystal for time keeping. A maximum error of about 1 minute per month can be expected. Larger errors are likely due to the clock being stopped while the battery is removed during a battery change.
After a battery change a screen is displayed that allows quick access to correcting the time. The time can also be corrected in the System Setup menu.
The Perdix will automatically turn-on when submerged underwater. This is based on pressure increase and not on the presence of water (i.e. the Perdix does not have wet contacts).
This feature is supplied as a backup for when you forget to turn on your Perdix. We recommend turning on manually before each dive to confirm proper operation and to double check battery status and setup.
Details:
The Perdix turns on automatically when the absolute pressure is greater than 1100 millibar (mbar). It can take up to 15 seconds for the Perdix to activate once 1100 mbar is exceeded. For reference, normal sea level pressure is 1013 mbar and 1 mbar of pressure corresponds to approximately 1 cm (0.4") of water.
So the Perdix will automatically turn-on when about 0.9 m (3 ft) underwater when at sea level. If at higher altitude, then the Perdix auto-on will occur at a deeper depth. For example, when at 2000 m (6500 ft) altitude the atmospheric pressure is only about 800 mbar. Therefore, at this altitude the Perdix must be submerged underwater by 300 mbar to reach an absolute pressure of 1100 mbar. This means the auto-on occurs at about 3 m (10 ft) underwater when at an altitude of 2000 m.
Summary: The guaranteed depth accuracy range is to 130 msw / 425 fsw. However, the case is rated to withstand 260 msw / 850 fsw. The depth sensor will continue to function to this depth, however, at reduced accuracy.
The pressure sensor that is used to determine depth is rated by the manufactured to be calibrated to a pressure of 14 Bar (about 130 msw / 425 fsw). It is designed to withstand pressures up to 30 Bar (290 msw / 950 fsw) . We find the sensors typically meet the EN13319 accuracy of +1m/-1.5m to about 190 msw / 625 fsw. The sensors continue to function to at least 300 msw / 985 fsw .
The Perdix case is rated to a crushing pressure of 260 msw / 850 fsw. The limiting factor is not the strength of the case, but rather the bending of the window inwards which eventually impacts the internal electronics and LCD display. We have tested units to dozens of cycles to 350 msw with no leaking or case failures. However, the window bends enough to impact the LCD, leading to damage or cracking of the display.
The Petrel is rated to a crushing pressure of 300 msw / 985 fsw because of larger internal clearances due to its thicker design. The window thickness, and therefore deflection, is about the same on both the Petrel and Perdix.
There are only a few differences between Perdix and the Perdix AI.
The Perdix AI is capable of connection with a transmitter to display air integration information. The Bluetooth chip is Bluetooth Smart as opposed to Bluetooth Smart Ready. Additionally there are extra reporting features in Shearwater Desktop specifically for the Perdix AI such as displaying the tank pressure throughout the dive, your SAC rate, as well as Gas Time Remaining information.
The Perdix AI does use radio waves at a frequency of 38kHz. Any source of interference such as some HID lights, camera strobes, scooters, or other high-powered electrical devices might emit interfering noise in this frequency range. The primary solution to these problems is to keep the Perdix AI computer away from these noise sources as much as possible. Modern LED lights are less likely to cause a noise problem.
Once paired the Perdix AI will remember the transmitter serial numbers until un-paired or changed, even with battery replacement.
The Perdix AI pairing to transmitters is via manual entry to ensure that the correct transmitter is paired for the safety of air pressure and gas time remaining displays.
AI will not affect the battery life of the Perdix AI when it is turned off. If the Perdix AI has AI enabled, power usage when on will increase by a small amount (roughly 10%, but this will vary) with one transmitter and a little more with two transmitters. If a transmitter is not being used, it is recommended that it be disabled (does not need to be unpaired) in the Perdix AI system menu.
The transmitters we supply are suitable for use with up to 40% O2 Nitrox. The question of usage with 100% O2 has a complex answer because there is no widely recognized scuba diving standard for what constitutes suitability for oxygen service. Hypothetically, the transmitter could be used with oxygen if we describe it as Nitrox Ready, otherwise you should assume air only service. The reason why we can't give you a simple unqualified "YES" is related to the associated risks when the circumstances of use are completely outside our control. To dive using oxygen requires you to make an informed decision to accept for yourself the risks of handling the oxygen.
Non-AI Perdix computers do not have the necessary hardware to support AI, and it is impractical to upgrade the hardware to add this support. The non-AI Perdix will still continue to be sold for those divers who do not plan or wish to use AI.
The Perdix AI does support two transmitters used on tanks in a sidemount configuration, however, gas time remaining (GTR) calculations are only supported for one selected transmitter (diver’s choice). Tank switching notifications are not supported in the initial firmware release.
The Perdix AI only supports two transmitters in the initial firmware release. This decision was made to reduce screen clutter and simplify the user interface.
GTR is similar to No Decompression Limit (NDL) in that it is the time, in minutes, that you can remain at the current depth until a direct ascent would result in surfacing with the reserve pressure remaining.
This calculation includes the gas used for the ascent but does not include any safety or decompression stops. The GTR display becomes blanked if decompression stops are required (it will return once cleared), so the diver must ensure they have enough gas if they expect to have decompression obligations. The GTR is based on the currently measured Surface Air Consumption (SAC) rate, averaged over the last few minutes.
The GTR calculations on the Perdix AI are only for single-tank diving that does not require decompression stops.
GTR is a tool for no-stop (i.e. no decompression) diving. We do not recommend GTR as a tool for decompression diving. Decompressing diving involves significant pre-planning of gas reserves and typically requires multiple tanks and gas mixtures. The complexities due to managing multiple tanks and differing styles of gas management would make setup of GTR too complex for reliable use. We tried this during development, and experienced testers frequently made setup mistakes that resulted in incorrect GTR. Shearwater feels that GTR is a great tool for single-tank, no-stop diving, but unfortunately does not work well for more complex diving.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
Shearwater recommends service of your dive computer every 2 years by an authorized service centre.
Please see our troubleshooting section here.
Try taking the battery out and leaving it out for at least 5 minutes. This should allow the transmitter to reset, and often solves a loss of communications.
The downloads for the Perdix are found HERE.
For full instructions with pictures explaining the best way to remove and replace the O-ring, please click HERE
We are sorry that you are having a problem with your dive computer that can't be resolved with our FAQ’s. If your dive computer needs some kind of repair, simply email us at info@shearwater.com to initiate the process.
Please include your name, address and phone number, description of your problem, unit model, S/N and Firmware Version. We’ll get you an RMA number and instructions on how to send your computer in for repair. Please do not return your computer to us or any of our service centers without an RMA number.
To find your S/N and firmware, turn on your computer (unless it won’t turn on) and from the main screen press the right side button 8-10 times until you see the S/N displayed (lower left) and Firmware (lower right) of the screen.
While almost any kind of AA battery will work with your Shearwater Perdix, 1.5V lithium batteries like the Energizer Ultimate Lithium work best. This battery type performs well in a wide temperature range and is much less likely to leak and cause damage to your dive computer.
Read more here: https://www.energizer.com/about-batteries/battery-leakage
Yes, the Perdix saves the decompression tissue loading in permanent (non-volatile) memory every 16 seconds when on, and every 5 minutes when off. After a battery change the tissue loading will be restored to the last saved value.
If the battery is removed shortly after a dive but then reinstalled some time (days) later, the residual inert gas loading will be restored even though your body will have returned to equilibrium values. If it has been more than 4 days since your last dive, it is safe to reset the tissues. Otherwise, do not reset the tissues and simply accept the higher conservatism for the next dive. Quick battery changes (battery out less than 10 minutes) do not suffer this problem, and the tissues should not be reset.
The standard decompression model is Bühlmann ZHL-16C with Gradient Factors. Also, the VPM-B decompression model is available by purchasing an unlock code. More information can be found in the .
Recommended reading is Clearing up the Confusion About ‘Deep Stops - Eric C. Baker, P.E.
The GF99 value shows the current leading tissue inert gas super-saturation percent gradient as defined by the Bühlmann ZHL-16C decompression model. If that sounds confusing, then recommended reading is Erik Baker’s paper, “Clearing Up Confusing About Deep Stops”.
This value can be used as a rough measure of the current decompression risk. A value of 100% (Bühlmann’s originally allowed super-saturation limit) is now generally accepted to be too risky. The GF low and high conservatism settings are used to scale Bühlmann’s original limits to reduce risk of decompression sickness. The default GF low value of 30% limits the super-saturation gradient at the deepest stop. The default GF high value of 80% sets the surfacing limit. Between the deepest stop and the surface the GF limit is linearly interpolated.
The GF99 value shows the current super-saturation as a percentage of Bühlmann’s original limits. If no super-saturation exists, then the GF99 displays “On Gas”. Once a super-saturation exists, the GF99 is displayed in green. It switches to yellow when the GF99 exceeds the value defined by the GF conservatism settings. Above 100% it is displayed in flashing red.
In extreme conditions, decompression risk can be traded for operational risk by using the GF99 display. For example, in a low-gas situation or perhaps a bailout or injury, you may want to get to the surface faster, but not blow off all the remaining decompression stops. You could then violate the stop displayed by the Predator, and decide to follow a more aggressive GF99, say 95%. This will get you out of the water faster, at a higher risk of decompression sickness, while still remaining within some limits. Upon resurfacing, appropriate action for omitted decompression should be followed such as rest, surface O2, monitoring symptoms and contacting DAN or other diving medicine center.
Conversely, the GF99 value can also be used to add conservatism. For example, if you knew that you had been exposed to factors that increase decompression sickness risk such as exercising during the bottom time or being colder on deco than the bottom, then you could use this value to extend shallow stops. Of course, you could always just add a few minutes to your last stop, but this gives a quantitative measure to correlate with “how you feel” after the dive.
The @+5 (at plus five) feature shows the Time-To-Surface (TTS) in minutes if you were to remain at the current depth for 5 more minutes. The main screen NDL value can be setup to show @+5 once deco is required. The @+5 can be compared against the current TTS to provide a variety of information.
The @+5 can be used as a measure of how fast decompression is accumulating. For example, you could be on a wreck with a scheduled time to meet back at the boat. By looking at the @+5, you can tell how much more deco time staying 5 more minutes on the wreck would cost, and plan accordingly (keeping of course within gas quantity and other limits).
Also, the @+5 value can be used as a rough measure of on or off gassing and the current deco efficiency. For example, say you are decompressing from a deep dive where there is a nice reef at 50 feet. Once the 50 foot stop has cleared, it may not seem too appealing to just head up to the deco line to hang. If you look at the @+5 and it is 4 minutes less than the TTS, then this means you are getting about 80% deco efficiency, so you might decide to hang out to enjoy the reef a little longer. Once the @+5 has drawn equal with the TTS, you are no longer decompressing effectively. This means staying 5 more minutes will make the dive 5 minutes longer, but the deco stops won’t be any longer. This is helpful information in deciding when to head up.
Depth is not measured directly. Dive computers measure pressure, and convert this to depth based on an assumed density of water.
Water density varies by type. The weight of salts dissolved in saltwater make it heavier than freshwater. If two dive computers are using different densities of water, then their displayed depths will differ.
The water type can be adjusted on the Perdix. In the System Setup->Mode Setup menu, the Salinity setting can be set to Fresh, EN13319, or Salt.
The EN13319 (European CE standard for dive computers) value is between fresh and salt and is the Perdix default value. The EN13319 value corresponds to a 10m increase in depth for pressure increase of 1 bar.
The density value used for each setting is:
- Fresh Water = 1000kg/m³
- EN13319 = 1020 kg/m³
- Salt Water = 1030 kg/m³
In Gauge Mode the Perdix does not know what gas you are breathing and therefore cannot track the inert gas tissue loading.
- The Shearwater Perdix should be stored in a clean, cool and dry environment.
- Do not allow salt deposits to build up on your dive computer. Wash your computer with freshwater to remove salt and other contaminants.
- Do not use detergents or other cleaning chemicals as they may damage the Perdix dive computer.
- Allow to dry naturally before storing.
- Do not wash with high pressure water as it may damage the depth sensor.
- Store the Shearwater Perdix out of direct sunlight in a cool, dry and dust free environment. Avoid exposure to direct ultra-violet radiation and radiant heat.
- Do not store batteries in the Perdix for long periods (several months). Batteries can and do leak, so don’t risk your expensive computer on a simple task like removing batteries. Dead batteries are at a higher risk of leaking.
See the Perdix vs Petrel 2 comparison pdf.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
Yes, to unlock dive log recovery, go to “Dive Log->Edit Log Number” and set this to “9997”.
Now the “Clear Logs” menu option will be changed to “Restore Logs”. This will restore all deleted logs. To restore individually, go to the “Dive Log->Display Logs” page. Deleted logs will be grayed-out. Select the dive to restore, then press the right button until the “Edit Dive” menu comes up. This will have a restore option.
Remember to go back to “Edit Log Number” and set it back to its previous value. The next dive # will be the number entered here plus one (e.g. If 2 is entered, the next dive will be dive #3).
Yes, all settings and dive logs are saved in permanent (non-volatile) memory and restored after the battery is changed.
To reset the settings to defaults, use the “System Setup->Reset to Defaults” menu. You can choose to reset the settings, the deco tissues, or both.
When the battery is removed the clock stops running. Upon installation of the battery, the clock is loaded to the last saved value (saved every 16 seconds when on, and every 5 minutes when off).
The Perdix uses a highly accurate quartz crystal for time keeping. A maximum error of about 1 minute per month can be expected. Larger errors are likely due to the clock being stopped while the battery is removed during a battery change.
After a battery change a screen is displayed that allows quick access to correcting the time. The time can also be corrected in the System Setup menu.
The Perdix will automatically turn-on when submerged underwater. This is based on pressure increase and not on the presence of water (i.e. the Perdix does not have wet contacts).
This feature is supplied as a backup for when you forget to turn on your Perdix. We recommend turning on manually before each dive to confirm proper operation and to double check battery status and setup.
Details:
The Perdix turns on automatically when the absolute pressure is greater than 1100 millibar (mbar). It can take up to 15 seconds for the Perdix to activate once 1100 mbar is exceeded. For reference, normal sea level pressure is 1013 mbar and 1 mbar of pressure corresponds to approximately 1 cm (0.4") of water.
So the Perdix will automatically turn-on when about 0.9 m (3 ft) underwater when at sea level. If at higher altitude, then the Perdix auto-on will occur at a deeper depth. For example, when at 2000 m (6500 ft) altitude the atmospheric pressure is only about 800 mbar. Therefore, at this altitude the Perdix must be submerged underwater by 300 mbar to reach an absolute pressure of 1100 mbar. This means the auto-on occurs at about 3 m (10 ft) underwater when at an altitude of 2000 m.
Summary: The guaranteed depth accuracy range is to 130 msw / 425 fsw. However, the case is rated to withstand 260 msw / 850 fsw. The depth sensor will continue to function to this depth, however, at reduced accuracy.
The pressure sensor that is used to determine depth is rated by the manufactured to be calibrated to a pressure of 14 Bar (about 130 msw / 425 fsw). It is designed to withstand pressures up to 30 Bar (290 msw / 950 fsw) . We find the sensors typically meet the EN13319 accuracy of +1m/-1.5m to about 190 msw / 625 fsw. The sensors continue to function to at least 300 msw / 985 fsw .
The Perdix case is rated to a crushing pressure of 260 msw / 850 fsw. The limiting factor is not the strength of the case, but rather the bending of the window inwards which eventually impacts the internal electronics and LCD display. We have tested units to dozens of cycles to 350 msw with no leaking or case failures. However, the window bends enough to impact the LCD, leading to damage or cracking of the display.
The Petrel is rated to a crushing pressure of 300 msw / 985 fsw because of larger internal clearances due to its thicker design. The window thickness, and therefore deflection, is about the same on both the Petrel and Perdix.
No, the Perdix is a stand alone only product.
The Perdix does have a rebreather (CC) mode that uses internal fixed PPO2 setpoints. This is useful for calculating backup decompression schedules when diving a closed circuit rebreather.
The Petrel 2 will continue to be sold in the Fischer and DiveCAN models for connecting to a rebreather.
Non-AI Perdix computers do not have the necessary hardware to support AI, and it is impractical to upgrade the hardware to add this support. The non-AI Perdix will still continue to be sold for those divers who do not plan or wish to use AI.
Watch the tissues demo video.
Shearwater recommends service of your dive computer every 2 years by an authorized service centre.
Please see our troubleshooting section here.
To purchase the VPM-B upgrade you can contact any dealer from our dealer network, provide them with your serial number, and request to purchase the unlock code.
We recommend you remove alkaline batteries from your unit if you intend to store it for an extended period. Alkaline batteries have a tendency to leak when they have fully discharged.
The downloads for the Petrel or the Petrel 2 are the same downloads, and are found HERE
Yes. The original Petrel and Petrel 2 have the same firmware versions, and updates for either will be posted in our firmware downloads section.
For full instructions with pictures explaining the best way to remove and replace the O-ring, please click here.
The official determination of whether a Petrel supports the compass is checking the hardware version in:
System Setup->Adv Config->System Info
For SA and EXT:
Hardware version 2.4.0 or higher has the compass and Bluetooth Smart Ready.
For DiveCAN models:
Hardware version 3.4.0 or higher has the compass and Bluetooth Smart Ready.
We are sorry that you are having a problem with your dive computer that can't be resolved with our FAQ’s. If your dive computer needs some kind of repair, simply email us at info@shearwater.com to initiate the process.
Please include your name, address and phone number, description of your problem, your unit model, S/N and Firmware Version. We’ll get you an RMA number and instructions on how to send your computer in for repair. Please do not return your computer to us or any of our service centers without an RMA number.
To find your S/N and firmware, turn on your computer (unless it won’t turn on) and from the main screen press the right side button 8-10 times until you see the S/N displayed (lower left) and Firmware (lower right) of the screen.
While almost any kind of AA battery will work with your Shearwater Perdix, 1.5V lithium batteries like the Energizer Ultimate Lithium work best. This battery type performs well in a wide temperature range and is much less likely to leak and cause damage to your dive computer.
Read more here: https://www.energizer.com/about-batteries/battery-leakage
Battery life depends on two things: screen brightness and battery type.
The “Auto” brightness setting measures the ambient light to adjust the screen brightness for the best balance of battery life and screen readability.
On medium brightness a 1.5V alkaline battery gives about 35 hours of operation and 6 months of standby (battery in but computer turned off). The Shearwater Petrel uses a small amount of power while turned off to keep track of your tissue loading. Other types of batteries will give anywhere from 30 to 90 hours on medium brightness.[/accordion]
How can I tell if my Petrel1 has battery contact issues?
This issue is only present in computers built before January of 2014; this is because they were not built with gold plating.
If your computer exhibits the following symptoms, then this issue may apply to you:
- Spontaneous Resets
- Flickering of the Display
- Lower than expected battery life
- Fluctuating battery levels
Please refer to this document to help solve your problem:
The Shearwater Petrel has a super capacitor that provides power to the computer during a battery change. The Shearwater Petrel uses a small amount of power even while turned off to keep track of your tissue loading.
This super capacitor has enough energy to maintain your tissue status for at least 15 minutes. This means that if your battery change takes less than 15 minutes you can continue with repetitive dives. Additionally, you will not need to set the date or time as the Petrel will have remembered it.
The standard decompression model is Bühlmann ZHL-16C with Gradient Factors.
Also, the VPM-B decompression model is available by purchasing an unlock code.
More information can be found in the Other Downloads section.
Recommended reading is Clearing Up The Confusion About “Deep Stops” – Erik C. Baker, P.E.
The GF99 value shows the current leading tissue inert gas super-saturation percent gradient as defined by the Bühlmann ZHL-16C decompression model. If that sounds confusing, then recommended reading is Erik Baker’s paper, “Clearing Up Confusing About Deep Stops”.
This value can be used as a rough measure of the current decompression risk. A value of 100% (Bühlmann’s originally allowed super-saturation limit) is now generally accepted to be too risky. The GF low and high conservatism settings are used to scale Bühlmann’s original limits to reduce risk of decompression sickness. The default GF low value of 30% limits the super-saturation gradient at the deepest stop. The default GF high value of 80% sets the surfacing limit. Between the deepest stop and the surface the GF limit is linearly interpolated.
The GF99 value shows the current super-saturation as a percentage of Bühlmann’s original limits. If no super-saturation exists, then the GF99 displays “On Gas”. Once a super-saturation exists, the GF99 is displayed in green. It switches to yellow when the GF99 exceeds the value defined by the GF conservatism settings. Above 100% it is displayed in flashing red.
In extreme conditions, decompression risk can be traded for operational risk by using the GF99 display. For example, in a low-gas situation or perhaps a bailout or injury, you may want to get to the surface faster, but not blow off all the remaining decompression stops. You could then violate the stop displayed by the Predator, and decide to follow a more aggressive GF99, say 95%. This will get you out of the water faster, at a higher risk of decompression sickness, while still remaining within some limits. Upon resurfacing, appropriate action for omitted decompression should be followed such as rest, surface O2, monitoring symptoms and contacting DAN or other diving medicine center.
Conversely, the GF99 value can also be used to add conservatism. For example, if you knew that you had been exposed to factors that increase decompression sickness risk such as exercising during the bottom time or being colder on deco than the bottom, then you could use this value to extend shallow stops. Of course, you could always just add a few minutes to your last stop, but this gives a quantitative measure to correlate with “how you feel” after the dive.
The @+5 (at plus five) feature shows the Time-To-Surface (TTS) in minutes if you were to remain at the current depth for 5 more minutes. The main screen NDL value can be setup to show @+5 once deco is required. The @+5 can be compared against the current TTS to provide a variety of information.
The @+5 can be used as a measure of how fast decompression is accumulating. For example, you could be on a wreck with a scheduled time to meet back at the boat. By looking at the @+5, you can tell how much more deco time staying 5 more minutes on the wreck would cost, and plan accordingly (keeping of course within gas quantity and other limits).
Also, the @+5 value can be used as a rough measure of on or off gassing and the current deco efficiency. For example, say you are decompressing from a deep dive where there is a nice reef at 50 feet. Once the 50 foot stop has cleared, it may not seem too appealing to just head up to the deco line to hang. If you look at the @+5 and it is 4 minutes less than the TTS, then this means you are getting about 80% deco efficiency, so you might decide to hang out to enjoy the reef a little longer. Once the @+5 has drawn equal with the TTS, you are no longer decompressing effectively. This means staying 5 more minutes will make the dive 5 minutes longer, but the deco stops won’t be any longer. This is helpful information in deciding when to head up.
Depth is not measured directly. Dive computers measure pressure, and convert this to depth based on an assumed density of water.
Water density varies by type. The weight of salts dissolved in salt water make it heavier than fresh water. If two dive computers are using different densities of water, then their displayed depths will differ.
The water density is adjustable on the Predator. In the Advanced Config 1 menu, the Salinity setting can be set from 1000 kg/m³ to 1040kg/m³. A cubic meter of pure water has a mass of 1000kg. So what we are setting is the mass of salts dissolved in the water.
Some guidelines:
- Fresh Water = 1000kg/m³
- EN13319 = 1020 kg/m³
- Salt Water = 1025 to 1035 kg/m³
The EN13319 (European CE standard for dive computers) value is between fresh and salt and is the Predator default value. The EN13319 value corresponds to a 10m increase in depth for pressure increase of 1 bar.
Watch the tissues demo video.
In Gauge Mode the Petrel does not know what gas you are breathing and therefore cannot track the inert gas tissue loading.
- The Shearwater Petrel should be stored in a clean, cool and dry environment.
- Do not allow salt deposits to build up on your dive computer. Wash your computer with fresh water to remove salt and other contaminants.
- Do not use detergents or other cleaning chemicals as they may damage the Petrel dive computer.
- Allow to dry naturally before storing.
- Do not wash with high pressure water as it may damage the depth sensor.
- Store the Shearwater Petrel upright and out of direct sunlight in a cool, dry and dust free environment. Avoid exposure to direct ultra-violet radiation and radiant heat.
- Do not store batteries in the Petrel for long periods (several months). Batteries can and do leak, so don’t risk your expensive computer on a simple task like removing batteries. Dead batteries are at a higher risk of leaking.
See the Petrel_vs_Predator comparison pdf.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
Please see our troubleshooting section here.
Shearwater recommends service of your dive computer every 2 years by an authorized service centre.
To purchase the VPM-B upgrade you can contact any dealer from our dealer network, provide them with your serial number, and request to purchase the unlock code.
We recommend you remove alkaline batteries from your unit if you intend to store it for an extended period. Alkaline batteries have a tendency to leak when they have fully discharged.
The name of the o-ring used is AS568-112. The size of this o-ring is 1/2" ID by 3/32" width. This is the same o-ring used in the majority of DIN regulators (not Apeks however).
You can use replacement o-rings made of either nitrile, EPDM, silicone or viton. Be sure to use a lubricant compatible with the o-ring material selected. We recommend a Shore 70A durometer, however both harder and softer will work.
To improve the sealing performance and O-ring life span, the battery compartment O-ring gland design has been changed from a crushed gland to a radial gland. Identification of the new radial cap can be made by reading this article. All units being shipped from our factory currently have a radial battery cap.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
Shearwater recommends service of your dive computer every 2 years by an authorized service centre.
The NERD 2 has Bluetooth® wireless technology which means it will connect with Shearwater Desktop and Shearwater Cloud. However it will not work on Shearwater Desktop with Windows 7 and below.
For more detailed steps on how to set up your NERD 2 SA on your regulator, please review the Open Circuit Mounting Guide which can be accessed here.
For more detailed steps on how to set up your NERD 2 Fischer on your rebreather loop, please review the ClosedCircuit Mounting Guide which can be accessed here.
The NERD 2 comes with a rechargeable lithium-ion battery. It lasts roughly 18 hours while on medium.
The typical battery life is 5 years or 500 charge cycles.
The battery can be replaced at authorized service centers. The cost of replacement is $150 + shipping.
The turn around time for replacement is 5 business days after receipt of payment, excluding shipping time. The battery replacement includes inspection, functional testing and pressure testing.
If the battery is not meeting performance specifications within the 2-year warranty period it will be replaced free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
When storing your NERD 2 please ensure you have rinsed it in fresh water, store in a cool and dry place, and make sure to fully charge it prior to storage.
Yes the NERD 2 is compatible with the NERD 1 mounts.
Try taking the battery out and leaving it out for at least 5 minutes. This should allow the transmitter to reset, and often solves a loss of communications.
For full instructions with pictures explaining the best way to remove and replace the O-ring, please click here.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
We are sorry that you are having a problem with your dive computer that can't be resolved with our FAQ’s. If your dive computer needs some kind of repair, simply email us at info@shearwater.com to initiate the process.
Please include your name, address and phone number, description of your problem, your unit model, S/N and Firmware Version. We’ll get you an RMA number and instructions on how to send your computer in for repair. Please do not return your computer to us or any of our service centers without an RMA number.
To find your S/N and firmware, turn on your computer (unless it won’t turn on) and from the main screen press the right side button 8-10 times until you see the S/N displayed (lower left) and Firmware (lower right) of the screen.
The NERD is a full featured technical decompression dive computer. If you are familiar with the Shearwater Petrel or Predator, then you will be familiar with the NERD.
The NERD offers the same functionality and mode options as the Petrel or Perdix but does not run the same software version of firmware. You can read the latest firmware updates to the NERD by clicking here. The NERD has a full-color Mini-LCD display with the same resolution as the Petrel.
With the NERD, for the entire dive, you will see depth, time, decompression stops, and PPO2 readings all with a quick glance. Everything you need to know stays within your line of sight.
The NERD image appears 12 feet (4m) away. If your vision is corrected for 12 feet away, then you can read the NERD.
Although the NERD is located very close to your eye, you do not need near-vision correction. That is, bifocals or reading glasses are not needed nor wanted. The NERD’s optics make the screen appear further away than it actually is.
So the answer is maybe. You need to be able to see 12 feet away. Since you should be diving with correction at this range, most divers will be able to use the NERD. Note that a mask with bifocal near vision correction may cause problems with the NERD.
The NERD display appears about the same as a 32” TV would from 12’ away (a 81cm TV from 3.7m for the metrically inclined).
If you have used a Petrel or Predator (both 2.4” displays), the NERD screen appears the same size as if they were held 1 foot (0.3m) away from your eye. Most divers have no problem reading a Petrel or Predator from several feet away, so the NERD is very easy to read.
See our demo videos for real-life views
The NERD is typically placed to one side, either in the lower or upper range of vision, and so only partially blocks one eye.
Your brain does an amazing job of combining the information from your eyes and filling in missing information. As such, when you choose to look at the NERD display you will see it, but it will not seem to block much of your vision when you look away. It almost seems as if you can see through it.
If you only have vision in one eye, then unfortunately the NERD will probably block too much of your vision to be usable.
The NERD has two piezo-electric buttons located on the sides of the eyepiece. Pressing these buttons allows editing settings, changing gases, etc.
The button type and user interface are the same as on the Petrel and Predator dive computers.
There are two issues for compatibility: Mounting and PPO2 monitoring.
Mounting:
Compatible with all rebreathers.
The universal nylon strap mount makes the NERD compatible with every rebreather we have tried.
If you have any questions regarding mounting to a specific rebreather model, contact us and we’ll try to help. Note that other constraints (BOV access, other HUDs, etc.) should be considered when choosing a mounting position for the NERD.
If you don’t like our mounting strap, it detaches leaving a simple dovetail mount for customized solutions.
PPO2 Monitoring:
The NERD has two modes of operation for rebreather divers.
- Internal PPO2 – constant setpoint
In this mode the NERD assumes the rebreather is maintaining setpoint at a user selectable level (e.g. 0.7 or 1.3 ata).
All rebreathers that run fixed setpoints (most closed circuit models) are compatible with this mode.
- External PPO2 monitoring
This is where the NERD really shines. Having PPO2 values from 3 oxygen cells displayed in your vision for the entire dive is a great safety advancement. Always know your PPO2.
The NERD is sold with the standard 7-pin Fischer connector (103 size) for connection to oxygen cells. Any rebreather (closed or semi-closed circuit) that uses compatible O2 cells and can use a cable with Fischer connector is compatible with this mode of operation.
The NERD is mounted on an articulating arm that can adjust height, angle, and distance to account for physical differences between different divers.
The arm is easy to adjust without tools, but holds its position once set. During dive entries in high surf, the NERD may get knocked around a little, but is easy to reposition once underwater and things have calmed down.
Yes, the NERD can be used for Open Circuit diving. It has the same OC Trimix decompression capabilities as the Shearwater Petrel.
However, Shearwater Research does not currently provide a standard mount for Open Circuit diving.
The challenge for non-rebreather diving is where to mount the NERD. The rebreather mount can be removed, leaving a simple dovetail mount that can be adapted to other mounting methods.
No, there is not currently an Air Integrated (AI) model.
Please see our troubleshooting section here.
To purchase the VPM-B upgrade you can contact any dealer from our dealer network, provide them with your serial number, and request to purchase the unlock code.
We recommend you remove alkaline batteries from your unit if you intend to store it for an extended period. Alkaline batteries have a tendency to leak when they have fully discharged.
The name of the o-ring used is AS568-112. The size of this o-ring is 1/2" ID by 3/32" width. This is the same o-ring used in the majority of DIN regulators (not Apeks however).
You can use replacement o-rings made of either nitrile, EPDM, silicone or viton. Be sure to use a lubricant compatible with the o-ring material selected. We recommend a Shore 70A durometer, however both harder and softer will work.
To improve the sealing performance and O-ring life span, the battery compartment O-ring gland design has been changed from a crushed gland to a radial gland. Identification of the new radial cap can be made by reading this article. All units being shipped from our factory currently have a radial battery cap.
Shearwater Desktop is not supported by Catalina 10.15 or later.
You may need to reset the pram on your Mac.
Please see this page from Apple support: Resetting the PRAM on your Mac
We do!
We have recently released Shearwater Cloud, available for Android and iOS. It features dive download, firmware update and cloud sync.
Please take a look here.
Please see the Bluetooth Quick Start. If you are still having problems, please contact us.
Please see our troubleshooting section here.
This error means that Shearwater Desktop is unable to find any Bluetooth hardware on the PC or Mac. Usually this means the Bluetooth dongle is not properly plugged in but it could also be indicating other issues with the Bluetooth hardware.
To see a more detailed article identifying if this issue is affecting you and steps to resolve it click here.
If you’re still having trouble with your device please send us an email at info@shearwater.com.
This error occurs when Shearwater Desktop cannot find your computers Bluetooth signal. Here are some general tips to try:
- Make sure that your dive computer is showing the Bluetooth countdown.
- If you have an older Petrel, make sure the battery you are using is fresh.
- Keep Shearwater Desktop and your operating system up to date.
To see a more detailed article about error 175 please click here.
If you’re still having trouble with your device please send us an email at info@shearwater.com
For full instructions with pictures explaining the best way to remove and replace the O-ring, please click here.
Shearwater offers a worldwide 2-year warranty on all products. The warranty lives with the unit, not with the original purchaser. This means that whether you buy your unit from our dealer network or second-hand, the warranty will still be effective.
Shearwater will, at its sole discretion, repair or replace defective products covered under warranty.
Unauthorized repairs, accidental damage, or negligence are not covered by the warranty.
The warranty covers included accessories such as chargers and straps.
Do I need to register my computer for warranty?
No. The warranty is linked to the computer’s unique serial number.
Who do I contact if my computer needs a repair?
You can contact our support team directly at info@shearwater.com or fill out the RMA form (Return Merchandise Authorization) here: https://www.shearwater.com/rma-request-form/
You may also contact your closest authorized service center directly using the contact details at the bottom of the page.
Please do not return any products without first obtaining an RMA from the relevant service center.
How much will my out-of-warranty repair cost?
A computer that comes in for an out of warranty repair will need to be disassembled to properly test the components to determine the failure. Once the failure has been determined, we will be able to accurately calculate an estimate for the necessary repairs. Please note that to prevent usage of potentially non-functioning computers, if you decline the repairs, and wish to have the computer returned to you, it will be returned disassembled.
How long will the repair take?
Shearwater and its authorized service centers aim to finish warranty repairs and authorized out of warranty repairs within 5 working days of receipt.
Delays in repair time may result due to holidays, parts delays, and/or the requirement for the computer to be repaired at a different location.
Please contact the relevant service center for a more accurate timeframe.
What is Shearwater’s service shipping policy?
You are responsible for the cost of sending in the computer for repair. As a reminder, do not send your computer to any repair centre until you have obtained an RMA from that repair centre. For in-warranty repairs, the computer will be shipped back at no charge. For out of warranty repairs, the return shipping charge is included within the repair estimate. If you have an out of warranty repair that you choose to decline, you may ask to have the service centre destroy it or ship it back at your cost.
How often should I have my computer serviced?
Shearwater recommends a general service of your dive computer every 2 years by an authorized service center.
Does the warranty cover the rechargeable battery in my Teric/Peregrine?
It is important to follow the directions for charging/storage in the computer’s manual to ensure peak battery performance.
If the battery is not meeting performance specifications within the 2-year warranty period, it will be repaired free of charge. Variations to battery lifespan can be expected due to operating at extremes of the rated specification, such as high environmental temperatures or repeatedly fully discharging the battery.
Battery Leaks
Damaged caused by battery leaks in dive computers that use a user changeable battery is not covered under warranty. Shearwater recommends the use of a lithium battery such as the Energizer Ultimate Lithium 1.5v battery to reduce the chance of battery leaks. Leaving AA batteries (especially alkaline batteries) in devices for extended periods of time significantly increases the chance of damage from a battery leak.
DEMO & PRO Computers
Please note that the warranty with our Demo & Pro model computers are only available to the original purchaser. For demo models, this means the authorized demo centre that purchased the computer. For Pro models, this extends to the original instructor/dive professional that was confirmed at time of purchase. This warranty is absolutely non-transferrable as these models are not intended for resale.
Repairs/service can be performed on Demo and Pro models, but if you are not the original owner, there will be a cost for the service.
We are sorry that you are having a problem with your dive computer that can't be resolved with our FAQ’s. If your dive computer needs some kind of repair, simply email us at info@shearwater.com to initiate the process.
Please include your name, address and phone number, description of your problem, your unit model, S/N and Firmware Version. We’ll get you an RMA number and instructions on how to send your computer in for repair. Please do not return your computer to us or any of our service centers without an RMA number.
To find your S/N and firmware, turn on your computer (unless it won’t turn on) and from the main screen press the right side button 8-10 times until you see the S/N displayed (lower left) and Firmware (lower right) of the screen.
What type of batteries can I use in the Predator?
The recommended battery is the 3.6V Saft LS14500 battery.
Other 3.6V Lithium Thionyl-Chloride batteries are possible, but may not provide adequate performance. Many batteries of this type cannot provide enough current to run the Predator. Batteries should be rated to provide a continuous output current of at least 50mA. For example, the Saft LS14500C (note the “C”) does NOT work because it is only rated to 25mA continuous.
How should I change the batteries on the Predator?
Instructions on how to change the batteries on the Predator can be found here: Predator Battery Kit Installation
How long should the battery last?
A Saft LS14500 battery should provide 90 hours of diving (on medium brightness) in addition to 1 year of standby time.
Higher screen brightness will drain the battery faster. On high brightness, about 60 hours of diving can be expected. The “Auto” brightness setting measures the ambient light to adjust the brightness for the best balance of battery life to screen readability.
If you aren’t getting the expected battery life, see the next item.
I am getting a lot of low internal battery warnings, even with new batteries. What is wrong?
You should be getting 60 to 100 hours of battery life on a Saft LS14500 battery.
Lower battery life could be caused by a few reasons:
- Wrong battery type. The recommended battery type is the Saft 3.6V LS14500. Other Lithium Thionyl Chloride batteries may not provide enough current for proper operation.
- Poor contact in the battery holder. Some holders do not squeeze the battery tight enough. These low battery warning often occur during the dive. A small kit is available free of charge to fix this problem. Please contact Shearwater (info@shearwater.com) if you think you are having this problem.
- Battery passivation. This is an insulating layer that grows on the lithium anode during periods of storage, especially at high temperatures. The insulating layer burns off once the Predator is turned on, but the voltage drops during this time. If you see a single low internal battery warning after installing a new battery or after a period of storage, then this may be the cause.
- Other damage. It is possible your Predator is damaged and may need repairs. Contact us for support.
The Bluetooth connection is not working. What can I do?
See our Bluetooth Troubleshooting Guide.
How do I update the firmware?
Instructions for updating the firmware are available in the manual.
Why don't you make an app for my Ipad or Iphone? That would be awesome.
Yes, many divers are using Ipads or Iphones and they would make a good dive logging platform. Unfortunately, Apple requires an Apple Authentication Co-processor to establish a Bluetooth connection, and the Predator does not have this hardware. Apple products now allow connections without the Authentication Co-processor, but only with the new Bluetooth Low Energy specification, and again the Predator does not support this.
However, some third-parties are now working on Android apps that download directly from the Predator, so dive logging on tablets or smartphones should be available soon.
Note that Mac laptops and desktops are supported, only the mobile iOS products are not.
I don’t like your Desktop Dive Log program, how can I export my dives to another program?
The Predator is now supported by several third-party dive log programs, and we are working on getting more third party support. Many of the third-party programs provide direct download of dive logs via Bluetooth.
- JDiveLog (free, open source, direct download): http://www.jdivelog.org
- MacDive (Mac only, direct download): http://www.mac-dive.com
- DivePal (Requires log in, direct download): http://www.ediving.us/divepaldownload.php
- Diving Log (PC Only, no direct download, imports .swlogdata files): http://www.divinglog.de/english/home/index.php
- Subsurface (PC/Mac/Linux, free open source, direct downloads): http://subsurface.hohndel.org/
What kind of O2 Sensors can I use?
The Predator expects galvanic O2 sensors of the 10mV in air type. It assumes the sensors have linear response to PPO2 and have internal temperature compensation.
I am having problems calibrating. What can I do?
- Always follow the instructions provided by the rebreather manufacturer and training agency when O2 sensors.
- Cable and connector problems are also a common cause of failed calibrations.
- Failed or dying O2 sensors may fail to calibrate properly. Follow the replacement schedule as specified by the sensor manufacturer, the rebreather manufacturer and your training agency. Also, be aware that galvanic O2 sensors can be easily damaged by shock (e.g. when dropped).
- The Predator expects the mV output of the cells to be within 30mV to 70mV in 100% O2 at 1 atmosphere. These mV limits are scaled automatically with pressure changes and the Cal FO2 setting. If the measured mV is outside of the limits, that sensors will fail to calibrate.
I am getting strange or intermittent PPO2 readings. What should I do?
Cables and connectors are the most common points of failure. Inspect cables and connectors carefully. Try to isolate problems. For example, trying a new cable may help.
Failures of the O2 sensor cells themselves are also common . Paul Raymaekers of rEvo Rebreathers has written an excellent article on Understanding Oxygen Sensors used in rebreathers.
What is the pin-out of the Fischer connector?
Fischer Connector: Looking into the socket on the Predator
How do I maintain the Fischer connector?
Have a look at our Fischer maintenance guide.
Is PPO2 displayed in absolute atmospheres or Bar?
The Predator displays PPO2 in absolute atmospheres (ata).
- 1 ata = 1013 millibar = 1.013 Bar
The difference between Bar and ata is only 1.3%, so for practical purposes the displayed PPO2 values can be considered either ata or Bar.
I calibrated with the Fraction of O2 (FO2) set to 98%, but after calibration the PPO2 reads differently (for example, 0.96). Why?
The Predator automatically adjusts the calibrated PPO2 to adjust for variations in current barometric pressure (due to altitude or weather). PPO2 is dependant upon ambient pressure, so the calibrated PPO2 will not always match the Fraction of O2 in the calibration gas.
For example, say we are at sea level (normally 1 atmosphere or 1013 millibars), but a low pressure weather system has the barometric pressure reading 990 millibars. If we calibrate with an FO2 of 98%, then the expected PPO2 is (990/1013) x 0.98 = 0.96. So after calibrating, all three sensors in this case would read 0.96 (not 0.98).
This is the correct way to calibrate PPO2. However, if this difference drives you crazy or you want to match another dive computer that does not adjust for barometric pressure, then set the "Display Setup->Altitude" setting to "SeaLvl". This will assume that surface pressure is always 1013 millibars, and your calibrated PPO2 will match the FO2. Note however, that this is actually an incorrect calibration and you are introducing error into your PPO2 measurements by doing this. DO NOT use the "SeaLvl" setting when diving at altitude. That is, when diving at altitude above sea level, set the Altitude setting to Auto.
How often should I calibrate my O2 sensors?
You should follow your training agency and rebreather manufacturer guidelines regarding calibrations.
In the absence of these, we can offer what we believe to be best practices:
- Always calibrate when a new sensor is installed.
- Calibrating every dive is unnecessary and can actually mask the decline of dying cells.
- Better than frequent calibration is infrequent calibration (perhaps quarterly), but coupled with frequent verification of calibration accuracy.
- Calibration accuracy should be verified for every dive.
- Verification of accuracy should be done at multiple points, ideally with one point above a PPO2 of 1.0.
- For example, verify that the sensors read close to 0.21 in air (at sea level, adjust expected value if at altitude). A pre-dive flush of O2 should show the sensors come close to 1.0. Verifiying above 1.0 can be done by stopping to flush with O2 at 6m during the descent. Alternatively, small pressure chambers are available for testing cells up to a PPO2 of 1.6 on the surface.
The reason verification should be performed above a PPO2 of 1.0 is that O2 sensor current limiting is a common failure mode of these sensors as they age. Current limiting can cause a sensor to behave linearly below a PPO2 of 1.0, but then taper off quickly above 1.0.
Also, CCR divers should always use at least 2 independent PPO2 displays. Calibrations should not be done on both displays at the same time (unless new sensors are being installed, in which case both must be calibrated). When performing the calibration, there is a risk of making a mistake, resulting in an inaccurate calibration. If you perform both calibrations at the same time, both will be wrong and with this error potentially undetectable. If calibrations are done on different days, you still may not know which is correct, but at least you will notice the difference, allowing you to call the dive or bail out to open circuit (Of course if you had verified the accuracy of the calibration, you wouldn’t have gotten into such a situation).
Why don't you use two-point PPO2 calibration?
We do not believe two-point calibration offers any benefit and has some distinct drawbacks over a one-point calibration.
- Two-point calibrations are more complex and time consuming, resulting a higher chance for mistakes.
- Two-point calibrations can mask some types of cell faults.
We believe the best approach is a one-point calibration WITH frequent verification of calibration accuracy.
Frequent verification of calibration accuracy is critical. Verification should be done at a minimum of two known points, ideally with one point above a PPO2 of 1.0. Achieving a PPO2 above 1.0 can be done by flushing with O2 at 6m during the descent or by using small pressure chambers that are available for this specific purpose.
Is a bungee mount available?
Shearwater now provides a bungee mount solution. Contact your dealer or contact us.
Also, some third parties have made custom bungie plates that may be available (e.g. Narked at 90).
Some users also have clever ways of adding bungies to the stock mounting plate. Search forums for details.
To what depth is the Predator rated?
The depth sensor is rated to 130 meters (426 feet) of seawater. Deeper than this the accuracy is reduced. Testing has shown to accuracy to be within EN13319 limits to 190 meters. Absolute maximum pressure tolerated by the depth sensor is 300 meters.
The official rated crush depth is 185 meters. Predator and Pursuit dive computers have been taken to deeper depths without failure.
What maintenance is required for my Predator?
The Predator dive computer should be stored dry and clean. Do not allow salt deposits to build up on your dive computer. Wash your computer with fresh water to remove salt and other contaminants. Do not use detergents or other cleaning chemicals as they may damage the Predator dive computer. Allow to dry naturally before storing.
Do not wash under high pressure as it may cause damage to the depth sensor. Also do not remove the strap bracket assembly as it acts as protection for the depth sensor.
Store the Predator dive computer upright and out of direct sunlight in a cool, dry and dust free environment. Avoid exposure to direct ultra-violet radiation and radiant heat.
Why does my rebreather controller show “?” for the external battery?
The External Solenoid Battery is only sampled when the solenoid is on. The reason this is done is that an unloaded battery might have a high terminal voltage, eventhough the battery is actually almost dead.
If the solenoid has not fired yet, the External Voltage will display as a yellow "?".
When I bailout to Open Circuit, why does the solenoid keep firing?
The solenoid keeps firing because it is the safest mode of operation. For example, what if the switch to OC was the result of accidental and unnoticed button presses. In that case you would definitely want the solenoid to keep operating.
If you need the solenoid to stop injecting O2 during a dive, you must externally isolate the solenoid.
What is the 0.19 Setpoint setting for?
The 0.19 setting will stop solenoid injections while setting up on the surface, downloading dive logs, or updating firmware. DO NOT use the 0.19 setting when breathing on the loop.
If a dive starts on the 0.19 setpoint, the Predator will automatically switch to the normal low setpoint.
What decompression model does the Predator use?
The standard decompression model is Bühlmann ZHL-16C with Gradient Factors.
Also, the VPM-B decompression model is available by purchasing an unlock code.
More information can be found in the Other Downloads section.
Recommended reading is Clearing Up The Confusion About “Deep Stops” – Erik C. Baker, P.E.
What does the “GF99” display value mean?
The GF99 value shows the current leading tissue inert gas super-saturation percent gradient as defined by the Bühlmann ZHL-16C decompression model. If that sounds confusing, then recommended reading is Erik Baker’s paper, “Clearing Up Confusing About Deep Stops”.
This value can be used as a rough measure of the current decompression risk. A value of 100% (Bühlmann’s originally allowed super-saturation limit) is now generally accepted to be too risky. The GF low and high conservatism settings are used to scale Bühlmann’s original limits to reduce risk of decompression sickness. The default GF low value of 30% limits the super-saturation gradient at the deepest stop. The default GF high value of 80% sets the surfacing limit. Between the deepest stop and the surface the GF limit is linearly interpolated.
The GF99 value shows the current super-saturation as a percentage of Bühlmann’s original limits. If no super-saturation exists, then the GF99 displays “On Gas”. Once a super-saturation exists, the GF99 is displayed in green. It switches to yellow when the GF99 exceeds the value defined by the GF conservatism settings. Above 100% it is displayed in flashing red.
In extreme conditions, decompression risk can be traded for operational risk by using the GF99 display. For example, in a low-gas situation or perhaps a bailout or injury, you may want to get to the surface faster, but not blow off all the remaining decompression stops. You could then violate the stop displayed by the Predator, and decide to follow a more aggressive GF99, say 95%. This will get you out of the water faster, at a higher risk of decompression sickness, while still remaining within some limits. Upon resurfacing, appropriate action for omitted decompression should be followed such as rest, surface O2, monitoring symptoms and contacting DAN or other diving medicine center.
Conversely, the GF99 value can also be used to add conservatism. For example, if you knew that you had been exposed to factors that increase decompression sickness risk such as exercising during the bottom time or being colder on deco than the bottom, then you could use this value to extend shallow stops. Of course, you could always just add a few minutes to your last stop, but this gives a quantitative measure to correlate with “how you feel” after the dive.
What does the “@+5” display value mean?
The @+5 (at plus five) feature shows the Time-To-Surface (TTS) in minutes if you were to remain at the current depth for 5 more minutes. The main screen NDL value can be setup to show @+5 once deco is required. The @+5 can be compared against the current TTS to provide a variety of information.
The @+5 can be used as a measure of how fast decompression is accumulating. For example, you could be on a wreck with a scheduled time to meet back at the boat. By looking at the @+5, you can tell how much more deco time staying 5 more minutes on the wreck would cost, and plan accordingly (keeping of course within gas quantity and other limits).
Also, the @+5 value can be used as a rough measure of on or off gassing and the current deco efficiency. For example, say you are decompressing from a deep dive where there is a nice reef at 50 feet. Once the 50 foot stop has cleared, it may not seem too appealing to just head up to the deco line to hang. If you look at the @+5 and it is 4 minutes less than the TTS, then this means you are getting about 80% deco efficiency, so you might decide to hang out to enjoy the reef a little longer. Once the @+5 has drawn equal with the TTS, you are no longer decompressing effectively. This means staying 5 more minutes will make the dive 5 minutes longer, but the deco stops won’t be any longer. This is helpful information in deciding when to head up.
Why does the depth reading on my Predator disagree with my other computer?
Depth is not measured directly. Dive computers measure pressure, and convert this to depth based on an assumed density of water.
Water density varies by type. The weight of salts dissolved in salt water make it heavier than fresh water. If two dive computers are using different densities of water, then their displayed depths will differ.
The water density is adjustable on the Predator. In the Advanced Config 1 menu, the Salinity setting can be set from 1000 kg/m³ to 1040kg/m³. A cubic meter of pure water has a mass of 1000kg. So what we are setting is the mass of salts dissolved in the water.
Some guidelines:
- Fresh Water = 1000kg/m³
- EN13319 = 1020 kg/m³
- Salt Water = 1025 to 1035 kg/m³
The EN13319 (European CE standard for dive computers) value is between fresh and salt and is the Predator default value. The EN13319 value corresponds to a 10m increase in depth for pressure increase of 1 bar.
The “Auto” brightness setting measures ambient light levels to adjust brightness screen brightness for the best balance of battery life and screen readability.
When ambient light is strong (in direct sunlight for example), the screen brightness must be increased. Unfortunately, this uses more battery power. In low ambient light, brightness is decreased to prolong battery life.
One situation where “Auto” does not work well is a silt out. The ambient is low, so the screen brightness gets reduced. However, in this case you would want higher brightness to shine through the silt. If you expect a silt out, a fixed brightness (for example Medium) would work better.
Fixed brightnesses also provide more predictable battery life. Expected battery life is 120 hours on Low, 90 hours on Med, and 60 hours on High. Not getting this battery life? See the Batteries section.
The Auto altitude setting automatically compensates for surface pressure variations due to altitude or weather systems.
The other option "SeaLvl" assumes that the surface pressure is always 1 atmosphere (1013 millibar).
The recommended Altitude setting is "Auto". So why have the SeaLvl setting? It is for CCR divers who always want the PPO2 calibration result to equal the FO2 of the calibration gas.
The "OC Only" option simplifies the Predator operation when doing Open Circuit dives. It removes all menu options related to CCR diving. This makes the Predator easier to use, and reduces the risk of mistakes.
This option is not available on all models.
Predators and Pursuits have reached the end of their service life.
We no longer can access raw components for this computer.
We will continue to try to support repairs for as long as possible but repairs will be handled on a case-by-case basis.
If you have questions about a Predator or Pursuit repair please contact info@shearwater.com for more information.
Please see our troubleshooting section here.
To purchase the VPM-B upgrade you can contact any dealer from our dealer network, provide them with your serial number, and request to purchase the unlock code.
We recommend you remove alkaline batteries from your unit if you intend to store it for an extended period. Alkaline batteries have a tendency to leak when they have fully discharged.
The size of the o-ring is ¾” x 3/32”.
For full instructions with pictures explaining the best way to remove and replace the O-ring, please click here.
We are sorry that you are having a problem with your dive computer that can't be resolved with our FAQ’s. If your dive computer needs some kind of repair, simply email us at info@shearwater.com to initiate the process.
Please include your name, address and phone number, description of your problem, your unit model, S/N and Firmware Version. We’ll get you an RMA number and instructions on how to send your computer in for repair. Please do not return your computer to us or any of our service centers without an RMA number.
To find your S/N and firmware, turn on your computer (unless it won’t turn on) and from the main screen press the right side button 8-10 times until you see the S/N displayed (lower left) and Firmware (lower right) of the screen.
- Displays PPO2 from 3 oxygen sensors.
- Mounts on rebreather mouthpiece.
- Smithers code for PPO2 display.
- Robust piezo button (turn on/off and calibrate).
- Several year battery life on one Saft LS14500 battery.
Each LED shows the PPO2 from one oxygen sensor. The Smithers code blinking pattern is used. This pattern makes problems quickly obvious and noticeable.
One orange flash means PPO2 = 1.0 [ATM]. Each red flash indicates 0.1 PPO2 below 1.0. Each green flash indicates 0.1 PPO2 above 1.0.
There is a button on the box and it controls the HUD. One push turns it on and one push turns it off. Three pushes calibrates. If, when you turn it on, you get orange flashing for 30 seconds, that indicates a low battery.
To calibrate, you need to push the button three times within 1 second. It might take a little practice to get this, but it is intended to prevent accidental calibrations. If you successfully do the calibrate sequence, all three lights will come on bright red for 5 seconds. If you don't see that, it didn't get the calibration command.
After you calibrate, each of the sensors should be flashing one orange. That means the ppo2 is between 0.95 and 1.05. The actual value it uses for calibration is .98. If a sensor fails calibration, it will flash one red and one green. It can be useful to look at the millivolts display on the Shearwater computer to see why a sensor didn't calibrate. The rest of the flash pattern is: The number of greens is the number of tenths above 1.0 so three green is 1.3 ppo2. The number of reds is the number of tenths below 1.0 so two red is 0.8
The box contains the processor and battery. To change the battery, remove the top cover on the box. The battery should last for months or even years. The battery is a 3.6 V Lithium - Saft 14500
The box straps onto the breathing hose up beside your head so it is completely out of the way. At the same time, you can reach the button to turn it off and on. The LED display arm can be connected to any rebreather.
Here is the logic for the Shearwater HUD:
First, there are "bad" alarms and "good" alarms. For example a fire bell is a bad alarm. It is bad because the absence of a ringing bell doesn't mean there is no fire. It just means the alarm isn't ringing. The fire bell may not be ringing because the battery is dead, the smoke detector isn't in the right place, the installer screwed up the installation, there is a foreign object stuck in the ringer ........
It doesn't mean that everything is ok.
A good alarm is one where there is an obvious difference between the lack of function and the lack of an alarm. A solid green light doesn't do that.
There are integrated and redundant HUDs too. Integrated HUDs can alarm you for things like deco ceilings and distance from setpoint. But they can't do that and be redundant too. If you want redundant, then they have to be calibrated separately and they can't display "deco" information unless they have a separate deco computer with its own set of tissues, gases, etc.
And of course there is the HUD that just displays the setpoint. This type is very useful for scootering, low visibility, filming, and manually maintaining setpoint.
With the Shearwater HUD, we tried to find the best of all worlds. It displays the ppo2. Since it uses three LEDs, it can display them faster. A typical 1.3 takes about 2 seconds to read.
But instead of a continuously varying display time, it's always 5 seconds. It displays nothing in between. So as the ppo2 gets farther from 1.0 the light DENSITY gets higher.
So 0.80 is RR________ RR________ RR________ but 0.20 is RRRRRRRR__RRRRRRRR __RRRRRRRR__
And, if you are more than 0.50 away from 1.00, it turns up the power to the high intensity LEDs. So they get brighter.
At 0.20 you have three very bright red LEDs flashing just about continuously in the corner of your eye.
And there were a couple of unexpected benefits. You don't have to count. For me at least, if I engage my eyes to look, I don't need to actually engage my brain to count to 3. It's hard to explain, because obviously some part of my brain is counting.
And a stray sensor jumps out at you. All three flash three times, then one flashes once more. It catches your attention when they don't all flash the same number of times.
So the Shearwater HUD is a ppo2 meter that is redundant and also has some use as an alarm.
Yes. There are three connectors on either on the kidney or the triple connector. The HUD is added in the same way as a Jetsam display would be connected.
On the GF you were allowed to select from predetermined GF pairs. I selected the GF pairs available by asking divers who I respect what they are diving. However, now with the Pursuit, users are able to determine and enter their own Gradient Factors.
You can if you have the new style KISS displays. The new displays use a standard M12X1.5 cable gland, and the Shearwater uses the Jetsam kidney and triple connector. (Actually the kidney isn't quite the same as the Jetsam version. There is an extra machining step for holes.)
You can screw your existing display into the kidney or triple connector and plug the pins into the molex to share the sensor.
This is also the way you would connect the HUD to an existing Shearwater connection. If you have heat-shrink tubing, that would make this secure and neat. Otherwise, some electrical tape or a small zap stap will keep it secure.
A list of dealers can be found on our website.
NOTE: This is for the GF, not the Pursuit.
Unscrew and remove the clear lexan window (DO NOT REMOVE THE WINDOW ON ANY OTHER MODEL).
Unscrew the screw or screws holding the circuit board.
Carefully lift the circuit board just enough so that you can unplug the three connectors across the back of the board.
Unplug the three connectors from right to left. That is starting with the 2 pin connector.
Lift the board.
Replace the battery
Make sure the computer starts up properly. If it doesn’t, leave the battery out for 20 minutes, then put it in again.
Put the board back and plug in the connectors from left to right. Plug in the 2 pin last.
Carefully position the wires so that the board sits flat.
Screw in the board
Make sure the o-ring groove and the cover are clean.
Lightly lubricate the o-ring
Put the cover back on and screw it down. The screws don’t have to be very tight. The o-ring provides the seal. The o-ring should be compressed all around.
Inspect the o-ring seal around the cover to make sure you haven’t trapped any foreign material.
Predators and Pursuits have reached the end of their service life.
We no longer can access raw components for this computer.
We will continue to try to support repairs for as long as possible but repairs will be handled on a case-by-case basis.
If you have questions about a Predator or Pursuit repair please contact info@shearwater.com for more information.
The Pursuit has a battery compartment in the side of the case.
With a large coin unscrew the battery cap.
Carefully pull out the battery holder. To prevent battery bounce and rattling, It's a fitted tightly, so you will need something like a dental pick or a paper clip to pull out the holder. Change the battery.
The wires come from the main compartment of the computer through to the battery compartment on one side of the battery compartment.
The bottom of the battery holder is flat.
The bottom needs to be aligned with the wires as they feed through the case. Carefully fold the wires along the bottom of the holder and insert back into the compartment. Care must be taken not to pinch and score the wires.
Inspect and, if necessary, apply a light coat of silicone to the O ring in the battery cap. Reinstall the battery cap taking care not to pinch or deform the O ring.Finger tighten with a coin.
Have a look at our Fischer maintenance guide.
The recommended battery for the Predator, Pursuit, GF, and HUD is the Saft LS 14500. Other brands of 3.6 V Lithium AA batteries may experience poor battery connections and or battery bounce resulting in loss of power/brownout resets. Any modification to the battery connector to accommodate another brand of battery will void the warranty.
The Petrel and NERD can use a wide variety of batteries. See Battery Types for the Petrel and NERD.
Although stops aren't always exactly to the minute, this is by design. If you clear to the next ceiling after 10 seconds, it lets you go. It also takes a finite amount of time to calculate the ceiling, so it's possible for a stop to take a few seconds extra while the algorithm is calculating.
The TTS prediction is usually within a minute. With 5 hours of deco, it's still within a few minutes.
First, a bit of an overview of how the computer does this stuff.
There are two things going on all the time.
First, the compartment loading function uses the actual PPO2 and the actual depth to calculate the changes in compartment gas loading.
Second, the TTS function predicts the length of time at the current stop and the total TTS. It does this by using the current PPO2 and the profile. It always assumes that you are going to ascend smoothly at 30 feet per minute to the current ceiling, and then stay at that ceiling until it clears. If you have more than one CC gas programmed, it assumes that you are going to switch to that gas at an appropriate depth.
Anything that you do on the dive that is off profile will change the TTS and the time at the current stop prediction.
Some things have very little effect. Small changes in PPO2 on the bottom have very little effect. Small changes in PPO2 on shallow stops make a big difference.
Being a few feet off the stop at deep stops makes little difference. Being 10 feet off the stop at shallow stops makes a big difference.
Here are a few things that could cause that sort of problem.
1) Programming a CC gas and then not switching to it.
The gas will flash in that case. For example, I got a call last week about a 1 minute stop that took 4 minutes. He had 99% programmed as a CC gas. So here's what the computer assumes. You have told it you are going to switch by programming the gas in CC. If you were using it as bail out, you would have programmed it as an OC gas. The computer assumes that you are going to switch to O2 in the next second.
But you don't switch, so the compartment loading routines continue to offgas with your actual PPO2. The next TTS calculation, again assumes that you are going to switch to O2 in the next second but you don't switch and on and on....
2) Following the profile of another computer.
For example, if the Pursuit is showing a 100 foot ceiling, and you start doing stops at 150, the Pursuit will add deco time. For the TTS to match, the profile has to match.
3) Not being at the stop.
If you have a 10 foot stop of 20 minutes and you stop at 20 feet, it will take significantly longer. This is similar to number 1. The computer assumes that in the next second you are going to ascend at 30 feet per minute to 10 feet and complete your deco there.
However that compartment loading function is always calculating with your actual depth. So the prediction is always wrong.
By the way, there's nothing wrong with doing that. I will often do my 10 foot stop at 15 feet. The computer won't penalize you. But the time at stop estimate will always be too short for the above reasons.
The computer has two modes of operation, even when it isn't controlling the setpoint.
1) External PPO2
In this mode the computer monitors the all three sensors votes on their values, averages the sensors that are voted in, and uses this average to calculate decompression and CNS loading. When the computer is switched to this mode, the prompts regarding setpoint don't appear.
2) Setpoint PPO2
In this mode, the computer allows you to enter a low and high setpoint. You would typically enter these setpoints to be the same as you are using on your rebreather's setpoint controller. You can then easily switch between these setpoints when you switch your rebreather's setpoints.
In addition, you can configure the computer to automatically switch setpoints up and down at depths that you select. That allows the computer to accurately track your rebreather's setpoint without you ever having to touch the computer during a dive.
The short answer is no. Here are a few of the reasons.
1) Shearwater Research Inc. is an international exporter. Since all of our production is exported, the Canadian government doesn't charge us sales tax on those exports. In addition, the government refunds all sales tax that we spend in the production of our export goods. The government doesn't like to write us these checks so we get audited, and our sales have to match our exports. If we can't show documents that prove our exports match our sales, we are going to have to pay.
2) It is illegal in Canada to falsify government forms.
3) We have to insure for the full value. Our customers would not be happy if the shipment were lost and they lost their money because the shipment was undervalued.
4) In this era of tighter border control, the last thing we want is increased scrutiny of our shipments because we have been caught doing something dodgy.