GARMIN Descent MK3i 51mm w/Black Silicone



The GARMIN Descent MK3i 51mm Dive Computer in black silicone strap offers advanced features, SubWave™ communication, and user-friendly design. Dive smart!

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GARMIN Descent MK3i 51mm

The GARMIN Descent MK3i 51mm Dive Computer w/black silicone strap is the ultimate tool for divers seeking advanced features and robust performance. Designed to cater to both recreational and technical divers, the MK3i combines state-of-the-art technology with user-friendly functionality. The larger 51mm design ensures that you have all the information you need at a glance, without compromising on style or comfort.

Furthermore, the MK3i incorporates SubWave™ sonar-based communication, providing reliable data transmission even in challenging underwater environments. This innovative technology enhances your diving experience by allowing seamless communication between devices, ensuring that you stay connected and informed throughout your dive.

  • Subwave sonar-based diver messaging (coming soon)
  • Up to 66 hours of battery life in dive mode
  • Choose from multiple dive modes
  • Diveview™ colour maps with depth contours and dive sites
  • Use the dive readiness tool to inform your preparation
  • Built-in LED flashlight works above or below water

Key Features of the GARMIN MK3i

SubWave™ Sonar-Based Communication: With SubWave™ technology, you can ensure strong and reliable communication and data transmission between your dive computer and other devices. This feature is particularly useful for monitoring tank pressure and other critical data, providing an extra layer of safety and convenience.

Versatile Dive Modes: Moreover, the MK3i supports a range of dive modes, including single-gas, multi-gas, gauge, apnea, and closed-circuit rebreather (CCR). This versatility allows you to tailor the dive computer to your specific needs, whether you are on a shallow recreational dive or a complex technical dive.

High-Resolution Display: Additionally, with a bright, high-resolution color display, the MK3i ensures that all your dive data is easy to read, regardless of lighting conditions. The larger screen size enhances readability, making it effortless to monitor critical information.

Integrated GPS: Furthermore, built-in GPS, GLONASS, and Galileo support allow for precise navigation, marking of entry and exit points, and accurate tracking of your dive path. This feature is essential for effective dive planning and post-dive analysis.

Comprehensive Safety Features: In addition, customizable dive alerts, a 3-axis compass, and various sensors monitor depth, time, and decompression status, ensuring you have all the necessary safety information at your fingertips.

Health Monitoring: The wrist-based heart rate monitor and pulse oximeter provide crucial health metrics, informing you about your physical condition during and after dives.

Garmin Dive App Compatibility: Finally, seamlessly log and share your dives with the Garmin Dive app. This integration allows for detailed analysis of your dive data, connecting with the diving community, and enhancing your overall diving experience.

Additional Features

Pair with our Descent™ T2 transceivers (sold separately) for integrated pressure monitoring on up to 8 tanks via the SubWave sonar data network.

Exchange preset diver-to-diver messages (coming soon) up to 30 metres as well as monitor tank pressures and depth for up to 8 divers within a range of 10 metres.

This Garmin-first technology shows how lifestyle factors such as sleep, exercise, stress and jet lag can affect your body — to help gauge when you are best prepared to dive.

Get multiple dive modes for single and multiple gas dives (including nitrox and trimix), gauge, apnea, apnea hunt and closed-circuit rebreather.

Colour maps on your wrist offer bathymetric depth contours and more than 4,000 dive sites to help you discover new places to dive and get oriented.

With its bright 1.4″ AMOLED colour display, sapphire lens, 200-metre dive-rated case and leakproof metal inductive buttons, this dive computer is built to go deep.


Feature Details
Display Type High-resolution color
Battery Life Extended with efficient power management
Dive Modes Single-gas, multi-gas, gauge, apnea, CCR
Navigation GPS, GLONASS, Galileo
Safety Alerts Customizable alerts, 3-axis compass
Health Monitoring Wrist-based heart rate monitor, pulse oximeter
Connectivity Bluetooth, Garmin Dive app, SubWave™
Durability Robust design with black silicone strap

Why Choose the GARMIN Descent MK3i 51mm w/Black Silicone Strap?

The GARMIN Descent MK3i 51mm Dive Computer offers an impressive array of advanced features in a durable and stylish package. Moreover, with its versatile dive modes, SubWave™ sonar-based communication, and comprehensive safety and health monitoring, the MK3i provides everything a diver needs for a successful and safe dive. Therefore, enhance your underwater adventures with the reliability and precision of the MK3i, designed to meet the needs of all diving enthusiasts.

Detailed Features

Store and review data, track gear, take notes — and share via the Garmin Dive™ smartphone app.

See and be seen with variable light intensities and strobe modes, in or out of the water.

Stay in the water longer with up to 66 hours in dive mode plus up to 25 days in smartwatch mode.

Add screens for each dive mode that feature the fields you want to see.

To aid readability and help maintain night vision, an ambient light sensor gives a green luminescence to your watch face in low-light conditions.

Built-in ABC sensors, including an underwater compass, help navigate every part of your dive.

Track your entry and exit points on the surface with advanced satellite connectivity.

Pair the app with your Descent dive computer to automatically sync and upload your dive logs.

Use this GPS tool for surface navigation to a dive site so that you can drop right onto your target every time.

This tool helps you monitor your freedive descent and ascent rates through tone and vibration feedback.

Get a simplified dive screen on your wrist, with larger text to see critical diving data.

Stay current on ocean conditions by pairing your Descent Dive computer with your compatible smartphone.

Pair with inReach devices and the inReach dive case for satellite messaging off-grid.


The GARMIN Descent MK3i 51mm Dive Computer includes safety and tracking features. If you feel unsafe or if your watch senses an incident, it will send a message with your live location. Additionally, you can download songs and playlists from Spotify, Deezer, or Amazon Music for phone-free listening. Furthermore, the Garmin Pay™ contactless payments feature lets you breeze through checkout lines or transit systems with participating providers. Moreover, you can receive emails, texts, and alerts on your watch when paired with your iPhone® or Android™ smartphone. Finally, the Connect IQ™ Store lets you add watch faces, data fields, and apps to customize your paired smartwatch.

GARMIN Descent MK3i 51mm w/Black Silicone
Lens material Sapphire crystal
Bezel material Diamond-like Carbon (DLC) coated titanium
Case material Fibre-reinforced polymer with titanium rear cover
QuickFit™ watch band compatible Yes (26 mm)
Strap material Silicone or DLC-coated titanium
Physical size 51 x 51 x 16.4 mm
Fits wrists with the following circumference Silicone band: 135-230 mm
Extra long silicone band: 135-355 mm
Titanium bracelet: 135-220 mm
Weight No bands: 77.8 g
Silicone band: 105.6 g
Titanium band: 165.9 g
Leakproof inductive buttons
Display Size 35.56 mm (1.4”) diameter
Display Resolution 454 x 454 pixels
Colour display
Battery life Smartwatch: Up to 25 days (10 days always-on)
Battery saver watch mode: Up to 31 days
GPS Only: Up to 76 hours (56 hours always-on)
All Satellite Systems: Up to 55 hours (43 hours always-on)
All + Multi-band: Up to 48 hours (38 hours always-on)
OR Satellite Systems + Music: Up to 17 hours
Max Battery GPS: Up to 118 hours
Expedition GPS: Up to 24 days
Dive mode: up to 66 hours
Dive Mode with Air Integration: Up to 40 hours
Charging method Garmin proprietary clip charger
Memory/history 32 GB


Daily smart features

Connectivity Bluetooth®, ANT+®, Wi-Fi®, SubWave™
Connect IQ™ (downloadable watch faces, data fields, widgets and apps)
On-device Connect IQ™ Store
Smart Notifications
Text response/reject phone call with text (Android™ only)
View images from notifications on watch (Android™ only)
Morning report
Weather forecasts
Realtime settings sync with Garmin Connect™ mobile
Battery Saver – customisable low power watch
Controls smartphone music
Plays and controls watch music
Find my phone
Find my watch
VIRB® camera remote
Smart trainer control
Compatible with Garmin Connect™ Mobile
Smartphone compatibility iPhone®, Android™
Red shift mode


Diving features – GARMIN Descent MK3i 51mm w/Black Silicone

Dive activity maximum operating depth 200 metres 200 meter
Single-gas mode
Multi-gas mode
Gauge mode
APNOEA hunt mode
Decompression model Bühlmann ZHL-16c with gradient factors
Nitrox support
Trimix support
Closed Circuit Rebreather (CCR)
Gas mixes Air, Nitrox and Trimix, up to 100% O2; 1 bottom gas and up to 11 deco and/or backup gases
PO2 Up to 2.0 with customisable deco PO2 setting
Subwave™ Support
Air integration Yes (via Subwave™)
Number of transmitters supported 8
Gas time remaining
Gas consumption rate
Auto start/end dive
Custom end-dive timeout Yes (20s to 10m)
Safety Stop Yes (customisable off/3min/5min)
Deep Stops Yes (using custom gradient factors)
Customisable conservatism Yes (low/medium/high or custom using gradient factors)
Dive ascent/descent rate indicator
Automatic altitude adjustment
No fly time
Dive planner Yes (basic NDL + multi-gas deco planner)
Backlight Yes (configurable time and intensity; auto-on at depth)
Automatically saves dive entry and exit locations
Custom dive data screens
Sync dive log to Garmin Dive™ Mobile app
Alerts & alarms Audible and vibration alarms for ascent rate, PO2, CNS/OTU, NDL, deco, gas switching, tank pressure, gas consumption rate. Customisable (up to 40) audible and/or vibration per dive mode, based on depth or time
3-axis dive compass Yes (with adjustable heading, quick change to 90R, 90L and reciprocal). Indicates degrees and direction back to set heading
Missed Deco Lockout Yes (can be disabled prior to dive with user acknowledgement)
Residual Tissue Loading Reset Yes (on the surface with user acknowledgement)
Surface diver status widget Yes (surface interval, N2/HE loading, CNS, OTU and tissue compartment status)


Safety and tracking features

Incident Detection during select activities
Incident detection alert on phone for wearables
Group LiveTrack
Live Event Sharing


Additional information

Additional information