Shearwater Research Petrel 2 SA

Starting at $867.00
On Order
The Petrel2 Dive Computer incorporates a powerful feature set, easy to understand menus, easy to read full color display. The Petrel2-SA was recently updated to include a titanium bezel.

Petrel dive computers have stopped shipping from the Shearwater factory due to severe supply chain issues and component shortages. We do not have a clear date as to when they will be available.

Shearwater Research Petrel 2 SA

Shearwater Research Petrel 2 SA
Shearwater Research Petrel 2 SA In the Box Complete Kit Side View Back View Side View
  • Robust fully featured decompression dive computer
  • Three-axis tilt-compensated digital compass
  • Will NOT "lockout" after a missed stop or ascent rate violation
  • Accepts any type of AA size user-changeable battery
  • Logbook of last 1000 hours of diving

The Petrel 2 from Shearwater Research of Canada is a full decompression dive computer incorporating the Bühlmann ZHL-16C algorithm, with user configurable Gradient Factors (GF). Gradient Factors allow the diver unique and individual control of their dive computer decompression calculations. Out of the box, all models include open-circuit and closed-circuit Air, Nitrox and Trimix mixed gas functionality. An optional PIN upgrade to the VPM or DCIEM decompression algorithm is also available. The Petrel 2 includes a richly featured 'gauge mode' configuration, along with a three-axis tilt-compensated digital compass. The included CCR mode for rebreathers provides the ability to perform constant PO2 set point calculations for deco. During a decompression dive, the Petrel 2 provides complete information displays of all required stop times. The Petrel 2 can provide time-to-surface based on "look ahead" at planned gas switches. Multiple gas definition presets are supported with any combination of oxygen, nitrogen and helium. The Petrel 2 will NOT "lockout" after a missed stop or ascent rate violation. The Petrel 2 offers a screen display utilizing a low-power consumption, 320x240 QVGA, full color LCD display. The display will automatically adjust intensity based on available light to make the display easily readable whether on the surface in sunlight, in open water or in a cave.

The Petrel 2 has been designed to accept any type of AA size battery including alkaline, lithium and rechargeables. Included with every Petrel 2 from Dive Gear Express are two elastic straps with buckles, gold contact battery holder and battery already installed (ready to dive out of the box!). The Petrel 2 also includes a titanium bezel and a screen protector already installed to help prevent scratches of the display face. The software includes a complete dive log manager, compatible with both MS Windows and MAC OS X, and can be downloaded from Shearwater's website along with the manual. The dive log manager supports log downloads and firmware updates via the Bluetooth wireless interface of the Petrel.

Technical Open-Circuit Features

  • Air/Nitrox/Trimix capable
  • 5 open-circuit gas switch presets
  • Bühlmann ZHL-16C algorithm with configurable Gradient Factors
  • GF presets for sport diving NDL safety factor: High = 35/75, Medium = 40/85, Low = 45/95, plus user defined GF
  • Optional Varying Permeability Model (VPM-B)
  • %CNS oxygen exposure tracking
  • Ascent rate monitor
  • Date, time and temp display
  • Easy to read large full color screen
  • Easy to use adaptive menus
  • Logbook of last 1000 hours of diving
  • Operational to at least { 980 fsw | 300 msw}
  • Battery voltage and warning
  • Metric and Imperial
  • Right or left wrist mountable
  • Battery life (Saft 3.6V LS14500) up to 100 hours of diving
  • Battery life (1.5V Alkaline) up to 35 hours of diving

Rebreather Features

  • Constant PPO2 Set Point
  • Automatic Set Point Switching
  • 5 additional CCR Diluent gas presets
  • 2 button push OC bailout


  • Three-axis tilt-compensated digital compass
  • Titanium bezel
  • Bluetooth Smart wireless upload/download
  • User upgradeable firmware
  • User changeable battery
  • Dive Log Software
  • Two Year Limited Warranty
More Information
Brand Shearwater Research
Weight 1.200000

Differences of Petrel vs Perdix Dive Computers

The Petrel was introduced in September 2012 and received a minor update as the Petrel2 in October 2014 to add the electronic compass. The Petrel2 received another minor update in September 2019 to add a titanium bezel. The Perdix, introduced in January 2016, while retaining identical software functionality represents a re-engineering of the case and electronics. The Perdix-AI, introduced in November 2016, includes support for wireless tank pressure monitoring. Compared to the Petrel display, the higher contrast Perdix display offers enhanced color range and saturation (especially reds, greens, and yellows). The power requirements of the Perdix are also significantly improved compared to the Petrel, offering 30% longer battery life (some users of the SAFT lithium battery may see as much as 50% improvement.)

The Petrel case is machined polyoxymethylene (aka POM and Delrin), which limits some of the case design options when compared to the molded fiberglass reinforced nylon Perdix case. The Perdix case is lower profile with a more contoured shape that is form fitting to the wrist. While face dimensions are similar the significantly thinner Perdix is 30% less total volume and 30% lighter than the Petrel. The Perdix case also incorporates features to support both elastic straps and bungee wrist mounts. The Petrel LCD display itself is very slightly larger than on the Perdix, but this is evident only when they are held next to each other. The Petrel is depth rated to { 980 fsw | 300 msw} and the Perdix is depth rated to { 850 fsw | 260 msw }.

The very robust case and titanium bezel design of the Petrel2 is suitable for military, scientific and commercial diving activities. If you need support for monitoring external oxygen sensors found on rebreathers, you must select the Petrel2 EXT model. The Petrel2 design has been extensively qualified by rebreather OEMs and also written into the purchasing specifications of many governmental organizations.