Garmin Descent Mk3i 51mm – Dive Computer Watch

A full dive computer that lives on your wrist every day. The Garmin Descent Mk3i 51mm is a watch-style dive computer built for divers who want serious underwater capability — air integration, sonar messaging, multiple dive modes — in a titanium smartwatch they'll actually wear topside between dives.

Why it works. The Mk3i pairs a bright 1.4" AMOLED touchscreen under a sapphire lens with a 200-meter dive-rated titanium case whose metal buttons stay fully operational at depth. Below the surface it runs the dive modes that matter — single-gas, multi-gas, CCR (closed-circuit rebreather), gauge, and apnea/freedive — and topside it works as a full Garmin multisport GPS watch with maps, health tracking, and a built-in LED flashlight (white and red) that's genuinely useful on a night dive or a dark boat deck.

The features that set it apart:

• Air integration — paired with a Descent transceiver (sold separately), the Mk3i shows real-time tank pressure, estimated air-time remaining, and gas consumption right on your wrist.
• SubWave™ sonar — enables diver-to-diver text messaging and tank-data sharing underwater, where radio can't reach.
• 200 m dive rating with a full color, tap-through touchscreen that also drives with buttons in gloves or cold water.
• Multi-band GPS to auto-log dive entry/exit points and map your surface navigation.
• Multisport & health topside — wrist heart rate, Pulse Ox, sleep and training metrics, plus smart notifications, music, and Garmin Pay™.
• Up to 66 hours of battery in dive mode and up to ~30 days in smartwatch mode, so it's ready for a full liveaboard week.

Best for certified recreational and technical divers, freedivers, dive instructors and pros, and multisport athletes who dive and want one device for both worlds. Backed by Total Armor Security's 30-day satisfaction guarantee, with free shipping (over $100).

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