AMOLED clarity, SubWave™ air integration, and dive-ready maps—premium pro performance on your wrist.

The Garmin Descent Mk3i is a flagship watch-style dive computer built for serious recreational and technical divers. It pairs a bright, glove-friendly AMOLED display with a 200 m dive rating, multi-gas support (including trimix and CCR), and SubWave™ sonar networking for air integration and diver-to-diver features when used with the T2 transmitter. On land, it doubles as a full multisport smartwatch—making it an all-in-one tool for travel and training.

Key Benefits

• Exceptionally clear data AMOLED screen stays readable in dark wrecks or bright tropics, reducing strain and decision time.
• Scales from rec to tech Air, nitrox, trimix, and CCR modes mean you won’t outgrow your computer as your training advances.
• Smarter gas planning Pair with T2 transmitters for tank pressure, gas time remaining, and support for multiple transmitters—streamlining team dives.
• Trusted decompression Industry-standard Bühlmann ZHL-16C with user-set gradient factors lets you match conservatism to conditions and training.
• DiveView™ maps & entry/exit marks Color bathymetry and on-wrist maps help brief the dive and navigate smarter from shore or boat.
• Travel-friendly endurance Long battery life in dive mode reduces charging anxiety on liveaboards and multi-day trips.
• One device, all week Full smartwatch training, health, and notifications mean fewer gadgets in your bag.

Key Specifications

• Decompression Model Bühlmann ZHL-16C with user-configurable Gradient Factors
• Dive Modes Air, Nitrox, Trimix, CCR, Gauge, Apnea, Apnea Hunt
• Nitrox/Trimix Up to 100% O?; one bottom gas + up to 11 deco/backup gases
• Air Integration SubWave™ wireless (T2), supports up to 8 transmitters
• Depth Rating 200 m (656 ft)
• Display 1.2? (43 mm models) or 1.4? (51 mm models) AMOLED with sapphire lens
• Battery Life (Dive Mode) 43 mm: up to 30 hrs (?15 hrs with air integration); 51 mm: up to 66 hrs (?40 hrs with air integration)
• Case & Bezel Fiber-reinforced polymer case with titanium rear; DLC-coated titanium or bronze PVD titanium bezel (by variant)
• Bands QuickFit silicone or DLC titanium bracelet (by variant)
• Weights (with band) 43 mm silicone ~68.3 g; 51 mm silicone ~105.6 g; 51 mm DLC titanium bracelet ~165.9 g
• Wireless Multi-band GNSS (surface), Bluetooth, ANT+; SubWave™ sonar (underwater data/messaging with compatible units)
• Warranty (U.S.) 1-year limited warranty against defects; repairs/replacements typically covered for parts/labor (customer covers shipping); service replacements/repairs carry a 90-day warranty or the remainder of the original term, whichever is longer

Why this model? Mk3i delivers top-tier readability, modern mapping, and SubWave™ air integration in a rugged, 200 m platform that grows with your skills—from nitrox today to trimix or CCR tomorrow—making it a safer, longer-term investment than basic single-gas computers.