The Perdix and Petrel 2 dive computers offer many of the same features but whilst the Petrel 2 has an external connection model for remote PPO2 monitoring the Perdix is the more technologically advanced.
Feature | Perdix | Petrel 2 |
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Dimensions | 81 x 71 x 38mm | 83 x 74 x 39mm |
Volume | 110cm3 | 160cm3 |
Weight | 152g including alkaline AA battery | 218g including alkaline AA battery |
Buoyancy | 42g negatively buoyant | 60g negatively buoyant |
Display | 2.2" QVGA, Full colour LCD with always on LED Backlight | 2.4" QVGA, Full colour LCD with always on LED Backlight |
Display Colour Range | 35% NTSC | 22% NTSC |
Wrist Attachment |
2 x elastic straps with locking buckles |
2 x elastic straps with locking buckles |
Battery Life (3.6V Lithium) |
Brightness level & hours: Cave - 230 hours |
Brightness level & hours: Cave - 160 hours |
Battery Life (1.5V Alkaline) |
Brightness level & hours: Cave - 100 hours |
Brightness level & hours: Cave - 70 hours |
User Replaceable Battery | Yes - Double o-ring seal | Yes - Single o-ring seal |
Deco Tissues and Clock restored on battery change | Yes - store in permanent memory every 16 seconds | Yes - backed up by super-capacitor |
Settings retained on battery change | Yes - all settings saved in permanent memory | Yes - all settings saved in permanent memory |
Decompression Model |
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Models |
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Operating Modes |
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Gases | 5 each mode (air, nitrox, trimix) | 5 each mode (air, nitrox, trimix) |
Gauge (Bottom Timer) Mode | Yes | Yes |
Connectivity | Bluetooth Smart Ready (dual mode 2.1 / 4.0) | Bluetooth Smart Ready (dual mode 2.1 / 4.0) |
Firmware Upgrades | Yes - via Bluetooth | Yes - via Bluetooth |
Dive Planner | Yes | Yes |
Units | Metric and Imperial | Metric and Imperial |
Buttons | 2 Piezoelectric buttons | 2 Piezoelectric buttons |
Compass | Yes - 3 axis tilt compensated | Yes - 3 axis tilt compensated |
Launch Date | Jan 2016 | Oct 2014 |
The Perdix improves on the Petrel 2 by featuring:
- Significantly reduced thickness
- Double O-rings on the battery cap
- Integrated bungee mount holes
- Improved colour on the display
- 30% longer battery life
The firmware feature set is identical to the Petrel 2. The Perdix inherits Shearwater’s mature, easy to use, and well validated firmware. Both the Perdix and Petrel 2 will continue to be supported moving forward with free firmware updates.
The Perdix is a stand alone only product, meaning that there is no model with a connection to a closed circuit rebreather. The Perdix does have a closed circuit mode using fixed PPO2 setpoints (as does the Petrel 2). The Petrel 2 Fischer and DiveCAN models will continue to be sold for users requiring a connection to a rebreather. The Perdix display is slightly smaller than the Petrel, at 2.2” vs. 2.4”.
The Perdix display, however, features better colour, higher contrast, and lower power consumption.