Petrel Firmware V28

NOTE: You must have Shearwater Desktop 2.3.8+ to perform this update.

Download the complete change log in the Petrel Firmware V28 Release Notes

Listing of changes in Petrel Firmware v28


The above image illustrates the problem that has been fixed. This leg will now be correctly labelled as an ascent leg, with proper runtime and gas quantity.

All Models:

BUG FIX: Fixed a bug in the Dive Planner where under some circumstances an ascent leg would incorrectly labeled as a descent leg and given zero time duration. This would lead to incorrect gas usage calculations for this leg, as well as the run time being short by the time it would take for this ascent leg. Note that this affected the dive planner, and not the real-time decompression calculations. This fix is the only change for version 28.

9 Responses

  1. Firmware :v28 failed due too error #365

    “Send data failed CRC check” come up on desktop screen??

    • Avatar Shearwater Research

      Hi Wayne, the best thing to do is contact us at our address with your problem. Mark will be able to advise and assist you.

    • Hi from Athens and Merry Christmas….

      I have the shearwater-petrel and I tried to make the upgrade of V28 and error 365 is appeared . I did everything and
      unistalled the shearwater desktop many times with the same result.
      I am waiting for your help.

      Thank you in advance.

  2. Hi,

    Question :do I have to install the V27 before the installation of the V28 ?

    My petrel has has :

    firmware V21

    Hardware 3.4.0

    Thanks in advance

    • Avatar Shearwater Research

      No, you can go directly to V28.

  3. We need a transmitter for Open Circuit diving.Several people in our dive club won’t buy a Petrel because there is no transmitter. I appreciate it would be no good for CCR diving. However I feel it is a MUST for both Tec and Rec Open Circuit Diving.

  4. Avatar Jim

    Am having the same issue, what was the outcome and how resolve this matter as the new desktop does not allow me to upgrade my Petrel 1 to V28. Although my Petrel 2 is now V29. I have 2 computers one with the old version of desktop 2.3.8, but I cannot find the file from Shearwater to download (zip) and extract file.

    • Avatar Shearwater Research

      Hello Jim,
      Please contact us with your problem at our email address. We will direct your email to our tech support guru for assistance.


Leave a comment

Upcoming Dive Shows

Shearwater Research will be at the following dive shows:

DEMA SHOW 2019 (Orlando)

Read More / Nov 13-16 Booth No. 2537

Baltictech 2019

Read More / Nov 23-24 24


Read More / Dec 13-15 Booth No. 232

2020 Diving Festival Tokyo

Read More / Feb 1, 2020 - Feb 2, 2020

View All

2020 Underwater Intervention

Read More / Feb 4, 2020 - Feb 6, 2020 306

2020 Boston Sea Rover

Read More / Mar 7, 2020 - Mar 8, 2020

2020 Beneath the Sea

Read More / Mar 27, 2020 - Mar 29, 2020 738

2020 TecFestNZ

Read More / Apr 6, 2020 - Apr 8, 2020

2020 Adex Singapore

Read More / Apr 17, 2020 - Apr 19, 2020 Booth P10

2020 DRT Shanghai

Read More / Apr 24, 2020 - Apr 26, 2020

2020 TEKDiveUSA

Read More / Apr 25, 2020 - Apr 26, 2020 41

2020 Scuba Show Long Beach

Read More / May 30, 2020 - May 31, 2020 720

2020 MIDE

Read More / Jun 12, 2020 - Jun 14, 2020 406