Garmin Descent Mk3i 51 mm - 200-Meter Dive Rating

Garmin Descent Mk3i 51 mm is a watch-style dive computer with a 1.4-inch AMOLED touchscreen, GPS navigation, and a case rated for dives to 200 meters. Its built-in LED flashlight separates the 51 mm Mk3i from the smaller 43 mm model.

Dive Computer Hardware

The watch measures 51 x 51 x 16.4 mm and stores 32 GB of data. Its sapphire lens, titanium bezel, and leakproof metal buttons are documented in the technical specifications for the 51 mm model.

Garmin lists multiple dive modes, including single-gas, multi-gas, gauge, apnea, and closed-circuit rebreather modes. The Mk3i also supports air integration through the separately sold Descent T2 transceiver, which connects through Garmin's SubWave system.

Battery And Smartwatch Use

Battery performance reaches up to 25 days in smartwatch mode and up to 66 hours in dive mode. GPS-only operation reaches up to 76 hours, while the always-on smartwatch estimate is up to 10 days.

The 51 mm model works with Android and Apple iOS devices and includes Bluetooth, Wi-Fi, ANT+, built-in GPS, a compass, an accelerometer, a gyroscope, and a pulse oximeter. A charging cable and user manual are listed with the retail package.

Price And Position

Garmin introduced the Descent Mk3 series on November 14, 2023. The 51 mm Mk3i launched at $1,599.99 with a black silicone band and $1,799.99 with a DLC titanium band.

The smaller 43 mm Descent Mk3i launched at $1,399.99, while the standard 43 mm Descent Mk3 launched at $1,199.99. The 51 mm Mk3i therefore occupies the larger-display, flashlight-equipped position in the lineup, with air integration available through an additional transmitter.

Who It Fits Best

The Garmin Descent Mk3i 51 mm fits divers who need a dedicated dive computer with smartwatch functions, satellite navigation, extended battery estimates, and support for multiple gas configurations. Its 200-meter rating, 32 GB storage, and 1.4-inch display give it a specification set aimed at recreational and technical diving.

The size and price place it above ordinary fitness watches and general-purpose smartwatches. The optional Descent T2 is required for cylinder-pressure integration, and the titanium-band configuration raises the launch price to $1,799.99.