• Garmin Descent Mk3i smartwatch with a bronze bezel and a light gray strap, displaying the time and various diving metrics on its black screen.
  • Side view of the Garmin Descent Mk3i smartwatch, featuring a sleek design with three buttons and a two-tone strap.
  • Back view of the Garmin Descent Mk3i smartwatch showcasing its titanium case, sapphire lens, and green sensor light.
  • Garmin Descent Mk3i smartwatch displaying heart rate of 67 and a colorful graph of data from the last 4 hours.
  • Garmin Descent Mk3i smartwatch displaying dive data, including depth and pressure readings.
  • Garmin Descent Mk3i dive watch displayed from the side, featuring a bronze and white design with two buttons.
  • Garmin Descent Mk3i smartwatch displaying dive readiness score of 67, categorized as moderate, with a focus on energy levels.
  • Garmin Descent Mk3i dive watch displaying depth, no-decompression limits, and a message asking 'Are you okay?'
  • Garmin Descent Mk3i smartwatch displaying dive data including time, minimum temperature, and maximum depth.
  • Garmin Descent Mk3i smartwatch displaying diving modes including Single-Gas, Multi-Gas, CCR, Apnea, and Gauge.
  • Garmin Descent Mk3i dive watch displaying compass direction, depth of 17 feet, no-decompression limit, and elapsed time.
  • Garmin Descent Mk3i smartwatch displaying activity options including Swim, Bike, Run, Golf, and MTB on a black screen with a bronze bezel.
  • Garmin Descent Mk3i smartwatch displaying time and diving metrics, featuring a black strap and a round face with a digital interface.
  • Garmin Descent Mk3i smartwatch showing the back view with sensors and a black strap.
  • Garmin Descent Mk3i smartwatch shown from the side, featuring a black and gray design with a blue accent on the display.
  • Garmin Descent Mk3i smartwatch displaying dive information including time, minimum temperature, and maximum depth.
  • Garmin Descent Mk3i smartwatch displaying heart rate and activity data for the last 4 hours.
  • Garmin Descent Mk3i smartwatch displaying activity options for Swim, Bike, Run, Golf, and MTB on its screen.
  • Garmin Descent Mk3i smartwatch displaying various diving modes including Single-Gas, Multi-Gas, CCR, Apnea, and Gauge.
  • Garmin Descent Mk3i smartwatch displaying dive data, including depth and pressure readings.
  • Garmin Descent Mk3i smartwatch displaying a Dive Readiness score of 67, indicating moderate readiness and a focus on energy levels.
  • Garmin Descent Mk3i smartwatch displaying a topographic map with various depth contours and navigation details.
  • Garmin Descent Mk3i smartwatch displaying diving metrics, including depth, no-fly time, and a message asking 'Are you okay?'
  • Garmin Descent Mk3i dive watch displaying depth, no-decompression limit, and compass information on a black strap.
  • Garmin Descent Mk3i smartwatch displaying time and diving metrics on a black face with a rugged design.
  • Garmin Descent Mk3i smartwatch displaying diving metrics including depth, no-decompression limits, and a message asking 'Are you okay?'
  • Garmin Descent Mk3i dive watch displaying depth readings and tank pressure.
  • Garmin Descent Mk3i smartwatch displaying a colorful topographic map on its screen with navigational information.
  • Garmin Descent Mk3i smartwatch displaying heart rate and activity data for the last four hours.
  • Side view of the Garmin Descent Mk3i watch showcasing its black strap and buttons.
  • Garmin Descent Mk3i smartwatch displaying a dive readiness score of 67, indicating moderate energy levels.
  • Garmin Descent Mk3i dive watch displaying navigation data with depth, no-decompression limit, and timer features.
  • Garmin Descent Mk3i smartwatch displaying diving modes including Single-Gas, Multi-Gas, CCR, Apnea, and Gauge.
  • Garmin Descent Mk3i smartwatch shown from the side, featuring a black strap and three prominent buttons.
  • Garmin Descent Mk3i smartwatch with a black metal strap, featuring a digital display showing time, depth, and other diving metrics.
  • Garmin Descent Mk3i smartwatch displaying a detailed topographic map on its round screen, featuring a black strap and a sleek design.
  • Garmin Descent Mk3i diving smartwatch displaying depth, NDL, and directional information on a black background.
  • Garmin Descent Mk3i smartwatch displaying diving metrics including time, minimum temperature, and maximum depth.
  • Garmin Descent Mk3i smartwatch viewed from the side, showcasing its sleek design and buttons.
  • Garmin Descent Mk3i smartwatch displaying dive modes including Single-Gas, Multi-Gas, CCR, Apnea, and Gauge on a black background.
  • Garmin Descent Mk3i smartwatch displaying dive information, including depth and air pressure readings.
  • Garmin Descent Mk3i smartwatch displaying dive readiness level of 67, categorized as moderate, with a focus on energy levels.
  • Garmin Descent Mk3i smartwatch displayed from a side angle, featuring a rugged design and multiple buttons.
  • Garmin Descent Mk3i smartwatch showcasing its titanium case and black strap, viewed from the side.
  • Side view of the Garmin Descent Mk3i smartwatch featuring a black strap and blue accent buttons.
  • Garmin Descent Mk3i dive watch displaying depth, minimum temperature, and maximum depth readings on its screen.
  • Garmin Descent Mk3i smartwatch displaying activity options for Swim, Bike, Run, Golf, and MTB.
  • Garmin Descent Mk3i smartwatch displaying heart rate of 67 and a colorful graph representing data from the last 4 hours.
  • Garmin Descent Mk3i smartwatch featuring a black titanium case and bracelet, showcasing the back view with sensors and details.
  • Garmin Descent Mk3i smartwatch displaying depth information with the message 'Are you okay?' from a contact named Jamie.
  • Garmin Descent Mk3i smartwatch displaying options for Swim, Bike, Run, Golf, and MTB activities on a black screen.

Garmin Descent Mk3i

Garmin Descent Mk3i

$1,399.99
$1,399.99

010-02753-13

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Garmin Descent Mk3i smartwatch with a bronze bezel and a light gray strap, displaying the time and various diving metrics on its black screen.

Garmin Descent Mk3i

Equipped with SubWave™ sonar-based communication and air integration, the Garmin Descent Mk3i combines cutting-edge Garmin technology for an optimized diving experience—while also offering multisport training and smart features to support your active lifestyle on land.

About Garmin Descent Mk3i

The Garmin Descent Mk3i is a cutting-edge dive computer and smartwatch that combines advanced diving features with everyday wearability, offering a bright AMOLED display, multi-band GPS, and an impressive battery life.

DiveView Maps and Bathymetric Contours

Explore the underwater world like never before with DiveView maps on the Descent Mk3i. These maps provide color bathymetric depth contours and details on over 4,000 dive sites worldwide, enhancing your underwater navigation and planning.

  • Enhanced Navigation: Visualize coastal depth zones and underwater terrain to maintain better orientation during your dives.
  • Surface Interval Insights: During apnea surface intervals, easily view your dive entry and exit points on the map for improved situational awareness.
  • Interactive Mapping: Pan and zoom through maps, marking specific locations during your dives to revisit or share with fellow divers.

SubWave Sonar for Diver Communication

Stay connected with your dive group using Garmin's innovative SubWave sonar technology. When paired with the Descent T2 transceiver, the Mk3i enables seamless underwater communication and monitoring.

  • Diver-to-Diver Messaging: Exchange preset messages like "Are you okay?" or "Safely end dive" with other divers up to 30 meters away, ensuring everyone stays informed.
  • Comprehensive Monitoring: Keep track of tank pressures, depths, and other vital information for up to 8 divers within a 10-meter range, enhancing group safety and coordination.

Air Integration with T2 Transceivers

Achieve real-time awareness of your air supply by integrating the Descent Mk3i with the Descent T2 Tank Pod Transceiver. This wireless setup provides critical data at a glance.

  • Seamless Pairing: Mount the T2 transceiver directly onto your tank's first stage or high-pressure hose to transmit live data to your Mk3i watch.
  • Multi-Tank Support: Monitor up to eight tanks simultaneously within a 10-meter range, perfect for complex dives or group scenarios.
  • Durable Design: With a battery life of up to 100 hours on a single charge and a dive rating of 20 ATM (200 meters), the T2 transceiver is built to withstand deep dives.

Two-Way Diver Messaging

Enhance underwater communication with the Mk3i's two-way messaging system. This feature allows you to stay connected with your dive buddies, improving safety and coordination.

  • Preset Messages: Quickly send essential messages such as "Come to me" or "Safely end dive" to keep everyone on the same page.
  • Extended Range: Communicate with other divers up to 30 meters away, ensuring reliable contact even in low-visibility conditions.

Real-Time Depth Data Integration

Stay informed with accurate, real-time depth data displayed on the Mk3i's bright AMOLED screen. This ensures you have immediate access to critical information during your dive.

  • Live Depth Readings: Monitor your current depth with precision, essential for maintaining safety and optimizing your dive experience.
  • Integrated Compass: Utilize the electronic compass that functions underwater, aiding in navigation and helping you stay oriented throughout your dive.

Emergency Signal Transmission

Prioritize safety with the Mk3i's advanced emergency signal features, designed to provide peace of mind during your underwater adventures.

  • Distress Signals: In case of emergencies, send critical alerts to connected divers within a 10-meter range, ensuring prompt assistance when needed.
  • Proactive Alerts: Receive visual and vibrational notifications for low tank pressure, critical air levels, or communication issues, keeping you aware of potential risks.

Wireless Tank Pressure Monitoring

Keep a close eye on your air supply with the Mk3i's wireless tank pressure monitoring, providing real-time data to help you manage your dive effectively.

  • Accurate Readings: Monitor tank pressure, gas consumption rates, and remaining air time directly on your Mk3i, allowing for informed decisions underwater.
  • Group Monitoring: Track up to eight tanks within a 10-meter range, making it ideal for instructors or dive leaders overseeing group dives.

The Garmin Descent Mk3i is more than just a dive computer; it's a comprehensive tool designed to enhance every aspect of your diving experience. Whether you're exploring new depths or coordinating with your dive team, the Mk3i offers the features and reliability you need to dive with confidence.

Garmin Descent Mk3i Specifications

Display

  • Descent Mk3i (43mm): 1.2″ AMOLED color touchscreen display with a resolution of 390 × 390 pixels. The screen is protected by a sapphire crystal lens for scratch resistance.
  • Descent Mk3i (51mm): Larger 1.4″ AMOLED color touchscreen, with a higher 454 × 454 pixel resolution. It also uses a sapphire crystal lens. Both models offer vibrant, high-contrast displays, with the larger variant providing more screen real estate and bigger text for readability.

Battery Life

  • Descent Mk3i (43mm): Up to 10 days in smartwatch mode (around 4 days with always-on display). Supports roughly 28 hours of continuous GPS use (GPS-only) on a charge. In dive mode, it lasts up to ~30 hours (without air integration) or about 15 hours when using integrated tank pressure monitoring.
  • Descent Mk3i (51mm): Significantly longer battery life due to its larger battery. It lasts up to 25 days in smartwatch mode (≈10 days with always-on), and about 76 hours of GPS usage per charge. In dive mode, it can run ~66 hours (no transmitter) or up to 40 hours with air integration active.

Both variants also support power-saving modes: Battery Saver (up to 12 days on 43mm vs. 31 days on 51mm) and Expedition GPS mode for ultra-long tracking (up to 10 days vs. 24 days). The larger model’s battery advantage is a key consideration for those needing maximum endurance.

Diving Capabilities

  • Depth Rating & Build: Both Mk3i versions are fully dive-certified and water-rated to 200 meters (20 ATM). Each has a robust design with a fiber-reinforced polymer case and sapphire lens to withstand deep-water pressure and rough handling.
  • Dive Modes & Algorithm: Supports Single-Gas, Multi-Gas (Nitrox and Trimix up to 100% O₂), Gauge (bottom timer), Apnea (freediving), Apnea Hunt, and Closed-Circuit Rebreather (CCR) modes. Uses the Bühlmann ZHL-16c decompression algorithm with configurable gradient factors for safety.
  • Air Integration: Both Mk3i variants support wireless tank pressure integration via Garmin’s SubWave™ sonar technology, when paired with the Descent T2 transmitters. You can monitor up to 8 tanks/transmitters simultaneously.
  • Interface & Dive Tools: Includes a 3-axis digital compass for underwater navigation, customizable data fields, and preloaded dive site maps with underwater topography. GPS marks entry/exit points.
  • Notable Difference – Dive Torch: The 51mm Mk3i model includes a built-in high-intensity LED flashlight, a feature not available on the 43mm version.

Sensors

  • GNSS (GPS): Multi-band GPS, GLONASS, and Galileo with Garmin SatIQ™ technology for optimal accuracy.
  • Depth Sensor: Built-in depth gauge and water pressure sensor for precise depth readings.
  • ABC Sensors: Altimeter, Barometer, and 3-axis Compass for environmental tracking.
  • Heart Rate & Pulse Oximeter: Garmin Elevate™ wrist-based heart rate and Pulse Ox sensor for blood oxygen monitoring.

Smartwatch Features

  • Notifications & Apps: Pairs with smartphones (Android and iOS) for call, text, email, and app notifications. Supports Garmin Connect IQ™ for custom apps and watch faces.
  • Fitness Tracking & Sports: Logs daily steps, heart rate, stress, respiration, sleep, and Body Battery™ energy levels. Supports multiple sports, including running, cycling, swimming, skiing, and golf.
  • Music & Payments: 32GB of internal storage for music (Spotify, Amazon Music, Deezer). Supports Garmin Pay® for contactless payments.
  • Connectivity: Bluetooth, ANT+, and Wi-Fi for syncing data and updates. Compatible with Garmin Dive™ and Garmin Connect apps.

Durability & Build Quality

  • Water Resistance: Rated to 200 meters (20 ATM) and meets military-grade durability standards (MIL-STD-810).
  • Materials: Sapphire crystal lens, fiber-reinforced polymer case, and titanium bezel for lightweight durability.
  • Design & Ruggedness: Features inductive sensing buttons (no physical openings) for improved water resistance.
  • Bands and Fit: The 43mm model uses 20mm QuickFit® straps, while the 51mm uses 26mm straps. An extra-long dive strap is included.

Other Notable Features

  • Dive Readiness Score: Analyzes sleep, recovery, and stress to provide a daily readiness score for diving.
  • Underwater Communications: SubWave sonar system enables diver-to-diver messaging and real-time tracking of dive partners.
  • Safety and Emergency Features: Supports incident detection, SOS alerts, and Garmin inReach® satellite communicator integration.
  • Customization: Supports Garmin Connect IQ for additional apps, widgets, and customization options.
  • Built-in LED Flashlight: Available on 51 mm model only
  • Air Integration: Supports monitoring of tank pressures and depth for up to 8 divers when paired with the Descent T2 transceiver (sold separately)
  • SubWave™ Sonar Technology: Enables diver-to-diver communication via preset messages up to 30 meters and tank pressure monitoring within a range of 10 meters (with Descent T2 transceiver)
  • Dive Modes: Single and multiple gas dives (including nitrox and trimix), gauge, apnea, apnea hunt, and closed-circuit rebreather
  • Dive Log: Stores and reviews data, tracks gear, takes notes, and shares via the Garmin Dive™ smartphone app
  • DiveView™ Maps: Offers bathymetric depth contours and access to more than 4,000 dive sites
  • Surface GPS: Tracks entry and exit points on the surface (GPS tracking does not work underwater)
  • Health Monitoring: Wrist-based heart rate, advanced sleep monitoring, respiration tracking, Pulse Ox, and more
  • Sports Apps: Preloaded activity profiles for trail running, swimming, running, biking, hiking, rowing, skiing, golfing, and more
  • Smart Features: Smart notifications, music storage, Garmin Pay™ contactless payments
  • Connectivity: Bluetooth®, ANT+®, Wi-Fi
  • Memory: 32 GB internal storage

  • Garmin Descent Mk3i smartwatch
  • Descent T2 Tank Pod Transceiver
  • Charging cable and charging dock
  • USB power adapter
  • Quick start manual
  • Safety and warranty information

Customer Reviews

Based on 14 reviews
86%
(12)
14%
(2)
0%
(0)
0%
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0%
(0)
J
J.M.
Essential Monitoring Device for Stroke Recovery

Had s stroke and it helps my wife and my doctor monitor me

D
D.M.M.
Reliable Dive Watch with Solid Features, Strap Flaws

This is a specialized dive watch with excellent battery life and impressive accuracy. However, the strap feels a bit flimsy and might not be the most durable. You really need to buy the transmitter to get the full experience—otherwise, it’s similar to other models. I also wish it offered more customization options. Buy batterys formthe transmitter nice funcionality

N
N.H.
Versatile Dive Computer with Long Battery Life

This dive computer is simply fantastic! It’s awesome for not only diving but for everyday use as well. It tracks runs and workouts, steps, sleep and dive readiness and even has a ballistics function for those of us that like long range shooting (another expensive hobby).
Pros:
1. Fast charging
2. Long battery life (beats Apple Watches by far).
3. Easily synchs with your cell phone.
4. Built in light.
5. Great support.
6. Easy to use. Although it has lots of buttons, it makes it easier to navigate through all the pages. I find it easier to set up a tech dive over my Shearwater Perdix 2 and Apeks DSX.
7. Lots of apps you can download in the Garmin Connect store and change the watch face.

J
J.
Premium Diving Watch Perfect for Fitness Enthusiasts

Expensive, but worth every penny to me. As someone who is into diving and fitness, this is the perfect watch for me.

W
W.g.b.w.b.n.t.b.p.o.w.p.o.t.r.m.K.o.a.p.
Excellent Dive and Outdoor Activity Watch

Love this computer/activity watch. Great for diving and activities outside of diving!

123

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