Shearwater Perdix 3 Dive Computer

The Shearwater Perdix 3 is a full-featured technical dive computer built for divers who refuse to compromise. Designed to handle everything from your first open-water dive right through to complex trimix and closed-circuit rebreather (CCR) dives, the Perdix 3 is as capable as scuba dive computers get. At its heart sits an ultra-bright 2.4" AMOLED display with a crisp 450×600 resolution — a 19% larger screen and four times the resolution of the Perdix 2's LCD — housed inside an armoured casing with a precision-machined titanium bezel. Whether you're wreck diving in poor visibility or managing decompression stops on a deep technical dive, this computer keeps your critical information clear, accessible, and impossible to miss. Air integration supports up to four simultaneous Shearwater wireless transmitters, and a user-replaceable AA battery means you're never stranded. 

Features:

• Ultra-Bright 2.4" AMOLED Display — 450×600 resolution and full colour, readable in bright shallows and dark depths alike. Sunlight visibility is dramatically better than conventional LCD dive computers.
• Armoured Titanium Construction — Precision-machined titanium bezel and titanium piezo-electric touch buttons deliver a rugged, long-lasting build that takes the knocks of serious diving.
• Full Technical Diving Support — Bühlmann GF algorithm with full decompression planning, trimix support, multi-gas OC Tec mode, and CCR fixed PPO₂ mode. This is a true technical dive computer.
• Air Integration — Up to Four Transmitters — Simultaneously monitors tank pressure from up to four Shearwater wireless transmitters. Start simple, expand as your diving does.
• User-Replaceable AA Battery — No proprietary charging cradle, no waiting. Swap in any AA battery at the surface, in a remote dive location, or between dives on a liveaboard. Standard non-rechargeable lithium gives up to 60 hours.
• Freediving Mode — Configurable sampling rates, customisable vibration alerts (e.g. every 30 seconds and every 10 metres), and dedicated freediving alarms — all optimised for breath-hold diving without looking at the screen.
• Three Custom Display Layouts — Standard, Big, and Tec layout options across all dive modes, plus a flexible home screen and an oversized font option for instant at-a-glance data.
• High-Speed Bluetooth — Fast, secure, always-on-once-paired Bluetooth for 6× faster firmware updates and dive log downloads to the Shearwater Cloud app.
• Three Independent Settings Profiles — Save three completely different configurations and switch between them instantly — handy if you switch regularly between recreational, technical, and freediving.
• 3-Axis Tilt-Compensated Digital Compass — Accurate navigation regardless of wrist angle, shown directly on the dive screen.
• Strong Vibration Alerts — Shearwater's most powerful vibration motor, ideal for low-visibility conditions or freediving where you'd rather feel an alert than check the screen.
• GPS Transmitter Support — Compatible with GPS transmitters for surface position logging.
• Integrated NDL and Deco Planners — Plan dives directly on the computer before you get in the water.
• Detailed Dive Logs — Approximately 1,000 hours of dive log storage onboard.
• Security Features — Encrypted firmware and optional PIN codes protect against unauthorised log viewing or Bluetooth pairing.
• Existing Perdix Accessories Compatible — Current Perdix straps, protective cases, and screen protectors all fit the Perdix 3.

Display & Usability

The headline upgrade on the Perdix 3 is the display — and it's a big one. The 2.4" AMOLED screen delivers rich, vivid colour with true blacks, which means the contrast underwater is exceptional. At 450×600 resolution, everything is sharp. Numbers are large. Deco ceilings, gas pressures, and depth readings are all immediately readable even when you're task-loaded on a complex dive.

The interface has been redesigned so the menus now show the previous and next menu titles, meaning you always know where you are in the navigation. The new layout options — Standard, Big, and Tec — give you control over how your data is presented. The Big option is particularly popular among divers with any vision challenges or simply those who don't want to squint mid-dive.

The aluminosilicate toughened glass window protects the screen from knocks and scratches, and a screen protector is included in the box.

Diving Modes

The Perdix 3 covers the full spectrum of dive types in a single computer:

• Air — Standard single-gas diving on air.
• Nitrox — Single nitrox gas diving with configurable oxygen percentage.
• 3-Gas Nitrox — Multiple nitrox gases with switchable bottom and deco mixes.
• OC Tec — Full open-circuit technical mode: multi-gas, trimix support, and full decompression management using the Bühlmann GF algorithm.
• CC/BO (Closed Circuit / Bail-Out) — For CCR divers using fixed PPO₂ mode, with open-circuit bail-out gas management.
• Gauge — Bottom timer with stopwatch and dive logging for divers using their own tables or deco software.
• Freediving — Dedicated freediving mode with configurable alarms and sampling rates. Note: switching to or from Freedive Mode resets decompression tissue saturation.
• Avelo — Compatible with Avelo diving systems (unlock code required).

Air Integration

The Perdix 3 supports wireless air integration with Shearwater transmitters — up to four simultaneously. That's your primary and deco gases all covered. Tank pressure, remaining gas time (RGT), and low gas warnings all display directly on the dive screen.

If you're starting out and just need to monitor a single tank, one transmitter is all you need. As your diving progresses into technical configurations with stage cylinders and deco gases, you can add transmitters without needing to upgrade the computer itself. It's a genuinely scalable system.

The Perdix 3 also supports GPS transmitter integration for surface positioning data alongside your dive log.

Battery & Charging

One of the Perdix 3's biggest practical advantages is the user-replaceable AA battery. No charging cables, no waiting — if the battery dies, you replace it in seconds. It ships with an Energizer Ultimate Lithium AA, which gives the longest runtime at approximately 60 hours. Alkaline batteries will get you around 40 hours in a pinch.

For divers on liveaboards, in remote locations, or just anyone who's found themselves with a flat computer the night before a dive, this matters. A lot.

Note: vibration functions require either a 1.5V non-rechargeable lithium or a 3.7V lithium rechargeable battery.

App Connectivity

The Perdix 3 uses high-speed Bluetooth to sync with the Shearwater Cloud app (iOS and Android). Dive logs transfer six times faster than previous generations. The app lets you review your dives, update firmware, and customise computer settings. Bluetooth is fast, secure, and always-on once paired — no button sequence to enable it before each sync.

Who Is the Shearwater Perdix 3 For?

The Perdix 3 is designed for divers who are serious about what they do, whether that's recreational diving with aspirations to go further, or seasoned technical divers who need a reliable, readable, fully-featured computer they can trust on every dive.

Ideal for:

• Advanced recreational divers stepping into technical diving
• Technical divers using trimix or multiple gas mixes
• CCR divers needing fixed PPO₂ mode
• Freedivers wanting a dedicated freediving computer that also handles scuba
• Liveaboard and expedition divers who need long battery life in remote locations
• Any diver who values a clear, large display over a wristwatch-sized screen
• Divers who want to grow their setup — adding air integration transmitters over time

Possibly not the best fit if:

• You want a wrist-watch dive computer for everyday wear — check the Shearwater Teric instead
• You're a total beginner on a tight budget — the Perdix 3 is an investment in capability you may not need yet

Technical Specifications

What's in the Box

• Shearwater Perdix 3 Dive Computer
• 1.5V Energizer Ultimate Lithium AA battery (fitted)
• Black webbing strap (double)
• Screen protector
• Product info guide
• Ballistic nylon carry case

FAQs

Why Buy From Mike's Dive Store?

• Authorised Shearwater Dealer — We're an authorised UK dealer, which means your computer comes with full manufacturer warranty and support.
• Genuine Diver Expertise — Our team are active divers. We use this equipment. When we give you advice, it comes from actual underwater experience, not a product sheet.
• UK-Based Support — Talk to someone who knows their stuff. No call centres, no script-reading. Real divers, real answers.
• Servicing & Aftercare — We're here after the sale, not just before it. Need setup help or servicing advice? We've got you.
• Fast UK Delivery — Get in the water sooner.
• Straightforward Returns — If something isn't right, we'll sort it.

VIDEO CONSULTATIONS NOW AVAILABLE: We're bringing our highly experienced and knowledgeable staff to you with live-streaming consultations. If you need help choosing the right bit of kit or the best size before buying or even advice on whether a purchased item is the right fit for you, then book yourself a consultation appointment.