PETREL 3

The Shearwater Petrel 3 is a full-size dive computer built for recreational, technical, and closed-circuit rebreather diving, supporting gauge, air, nitrox, and trimix modes across both open and closed circuit configurations. It runs a 2.6-inch AMOLED display, the largest in the current Shearwater range, protected by a toughened aluminosilicate glass lens, an armoured titanium bezel, and titanium piezo touch buttons with adjustable sensitivity. The computer supports up to five open circuit and five closed circuit gases, with a state-aware menu structure designed to stay navigable across that range of modes.

Air integration is standard on the Petrel 3, connecting to up to four Shearwater transmitters, sold separately, covering configurations from single-tank open circuit diving through to rebreather bailout gas monitoring. Power comes from a single user-changeable AA battery, giving long dive times without a proprietary charging cycle and making battery swaps straightforward between dives. A three-axis, tilt-compensated digital compass is built in and available across all modes except DiveCAN recreational monitoring, which the Petrel 3 does not support. The standard decompression model is Bühlmann ZHL-16C with Gradient Factors, with VPM-B and DCIEM available as an unlock code purchase.

The vibration alert system is customisable, with continuous vibration on low or high external PPO2 for CCR divers, including a pause feature, and full vibration function requires a 1.5V non-rechargeable lithium or 3.7V lithium rechargeable battery rather than standard alkaline. Dive log capacity runs to approximately 1,000 hours. Bluetooth connectivity syncs dive logs and firmware updates to the Shearwater Cloud app across Windows, Mac, iOS, and Android. The Petrel 3 sits between the Perdix 2 and NERD 2 in Shearwater's technical range, sharing a similar footprint to the Perdix 2 but with a larger screen and heavier overall build.