The Shearwater Petrel dive computer is a robust and highly capable dive computer designed for serious divers who want one instrument to handle recreational through technical dives. Whether you’re doing air/nitrox, trimix, or closed-circuit rebreather (CCR) diving, this computer provides the features and depth-rating to support those missions.
If you’re looking for one of the best dive computer options available—especially among Shearwater dive computer models—this unit is aimed at experienced divers rather than casual entry-level users.
- What it is: a full-featured, multi-mode dive computer capable of open-circuit and closed-circuit operations with up to four gas pressure transmitters.
- Best for: technical divers, CCR users, advanced mixed-gas dives down to ~290 m/950 ft depth.
- Not for: casual recreational divers who don’t need deep trimix or rebreather functions and want a compact wrist-watch style unit.
- Key compatibility: supports up to four optional wireless tank-pressure transmitters, Bluetooth dive log upload, AA user-replaceable battery.
- Important limitation: the computer is physically larger and heavier than simpler units, and requires familiarization with advanced dive modes and settings.
| Dive Setup / Model | Required Port / Gear | Notes |
|---|---|---|
| OC/Nitrox/Trimix | Standalone Petrel 3 | Runs multiple gases without extra monitoring ports. |
| Rebreather (AK/4-pin) monitoring | Petrel 3 Monitor (4-Pin) model | Hard-wired CCR monitoring variant. |
| Rebreather (Fischer port) monitoring | Petrel 3 Fischer model | Includes Fischer connection; ideal for CCRs. |
Large AMOLED Display
The Petrel 3 features a 2.6″ (6.60 cm) AMOLED display that offers vivid visibility underwater and is protected by toughened aluminosilicate glass.
- Screen resolution: 320 × 240 pixels.
- Toughened aluminosilicate glass for impact resistance.
- Large screen ensures readability even with hood/gloves and in low-visibility conditions.
Air Integration & Tank Pressure Monitoring
Whether you’re on open-circuit or CCR, the Petrel 3 supports wireless tank-pressure monitoring through optional transmitters.
- Supports up to four wireless transmitters.
- Allows monitoring of multiple cylinders or bailout systems simultaneously.
- Bluetooth connectivity lets you upload dive logs to mobile/tablet after the dive.
Deep-Diving Capability
Built to handle serious depths, the Petrel 3 is rated for deep technical diving—open circuit or closed circuit.
- Depth rating: 290 m (950 ft).
- Multi-mode support: Air, Nitrox, 3-Gas Nitrox, OC Tech (Trimix), CC/BO, Gauge.
- Runs on a standard AA battery type, simplifying logistics for dive travel.
Perfect for…
- Technical divers planning deep open-circuit or trimix dives.
- Closed-circuit rebreather (CCR) users needing real-time PPO₂ and pressure monitoring.
- Exploration trips where long dive logging and multiple cylinder management are required.
- Dive travelers who appreciate the convenience of an AA-battery system and Bluetooth download.
Pros
- Extremely capable across recreational, technical and CCR diving modes.
- Large, bright AMOLED display improves readability in low light and through gloves.
- Flexible power option via AA battery means easier battery change and sourcing worldwide.
Cons
- Larger and bulkier than many wrist-watch style dive computers.
- Higher price point compared to basic recreational models.
- Advanced modes and options may require more setup and user knowledge.
The unit is manufactured by Shearwater, a well-known Canadian brand specialising in high-end technical dive computers. Warranty and returns depend on the specific dealer, but Bluewater Photo offers support including lifetime advice and setup guidance for underwater gear purchases.
Dive deeper, smarter and with one instrument that’s built for everything — the Petrel 3 covers your mission.
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A Comparison between the Shearwater Perdix 2 and the Shearwater Petrel 3 Dive Computers
| Feature | Shearwater Perdix 2 | Shearwater Petrel 3 |
|---|---|---|
| Display | 2.2-inch bright screen with aluminosilicate glass for durability. | 2.6-inch AMOLED display protected by toughened glass for enhanced visibility. |
| Air Integration | Supports up to four Shearwater transmitters for multi-gas monitoring. | Supports up to four Shearwater transmitters for multi-gas monitoring. |
| Vibration Alerts | Strong, customizable vibration alerts to notify critical dive information. | Strong vibration alert system for increased safety during dives. |
| Battery | User-replaceable single AA battery offering extended dive time. | User-changeable AA battery for long dive times and convenience. |
| Digital Compass | Tilt-compensated digital compass available in the unit. | Three-axis, tilt-compensated digital compass available for precise navigation. |
Full Specifications
Modes
- Air
- Nitrox
- 3 Gas Nitrox
- OC Tec - Multi gas, trimix decompression computer
- CC/BO - Closed circuit fixed PPO2
- Gauge - Bottom timer with stop watch and dive logging
Features
- User replaceable AA battery
- Air, nitrox, trimix capable
- Quick OC bailout from CC
- Decompression computer
- Dive planning
- Bühlmann GF algorithm
- Optional Air integration
- Connects up to 4 transmitters (optional)
- 3 axis, tilt compensated, digital compass
- Strong vibration warning alerts **Only 1.5V non-rechargeable lithium and 3.7V lithium rechargeable batteries support vibration functions.
- Optional VPM-B, Optional DCIEM
- Dive logging
- Bluetooth wireless technology
- Upgradeable firmware
Technical Specs:
- Screen Resolution: 320 x 240
- Display Type: AMOLED
- Display Size: 6.60cm / 2.6"
- Toughened Glass Window: Yes
- Depth Rating: 290m / 950ft
- Number of Gases: Number of Gases: 5 Open Circuit / 5 Closed Circuit
- Dive Log Capacity: approx. 1000 hours
- Battery Type: Single AA (any type)
Battery Life:
- Lithium 1.5V: up to 60 hours
- AA Alkaline: up to 40 hours
- Saft LS14500: up to 100 hours
Dive Computer Dimensions
- WxHxD: 83x75.5x39mm / 3.3"x2.97"x1.5"
- Weight: 266g (9.38oz)
Ballistic Nylon Case
- WxHxD: 130x105x70mm / 5.1"x4.1"x2.8"
- Weight: 115g (0.25lbs)
Weight:
0.25 LBS
Dimensions:
5.10
(in)
×
4.10
(in)
×
2.80
(in)
Brand:
Shearwater Research
In the Box
- Shreawater PETREL 3 dive computer
- Inspection Checklist Card
- Product Info Guide
- Screen Protector
- Black webbing strap (double)
