Descent Mk2i Scuba Diving Computer Review: Monitors Up to 5 Tanks via SubWave Sonar

Where the Descent Mk2i Fits

Garmin Descent Mk2i Titanium tracks 200 dives with a 16-day smartwatch battery life for users who need a durable, multi-sport capable subsurface computer.

A 16-day smartwatch battery life allows you to transition from a daily wearable to a specialized tool without worrying about frequent charging cycles. The Descent Mk2i provides this versatility while maintaining a 1.4 inch color sunlight-readable display that remains clear in bright conditions.

The Descent Mk2i supports up to 200 dive logs, recording and reviewing data from every session. This high storage capacity ensures that your dive history is preserved on the wrist rather than just on a mobile app.

We evaluated 15 scuba diving computers and selected the Descent Mk2i for a full review because it has 305 buyer ratings, the 2nd most of the 15 screened. Our comparison is based on a data-driven analysis of specifications and user ratings. This review is for an upgrader seeking a reliable, high-rated titanium model.

The Short Answer on the Descent Mk2i

Best for: you need a versatile dive computer that handles both deep-water diving and high-frequency smartwatch features like music and contactless payments.

The Descent Mk2i is a strong choice for multi-sport divers at the $699.99 price point.

• Pro: The 80-hour dive mode battery life provides enough power for a full 12-hour snorkeling trip or a 20-hour multi-sport triathlon.
• Pro: Integrated pressure monitoring on up to 5 tanks allows for shared data via the SubWave sonar data network.
• Pro: The 1.4 inch color sunlight-readable display provides a 36% larger viewing area than the previous model.
• Con: The 0.88-pound weight may feel heavy on the wrist during long periods of surface swimming compared to lighter-weight models.
• Con: A 15-hour battery life in GPS mode with music limits the duration of long-distance navigation when using streaming services.

Don’t buy this if: you require a device with a battery life exceeding 80 hours in dive mode, as this is the maximum capacity provided.

Price assessment: At $699.99, this watch sits at a premium price point for its inclusion of titanium construction and advanced sonar networking.

If you are still deciding, explore our roundup of the best watch-style dive computer.

The Specifications That Matter

Battery Life measures the total duration of continuous power supply, and the Descent Mk2i provides up to 80 hours in dive mode.

Before You Buy: Scuba Diving Computer Checklist

The first thing to check is the compatibility of your existing equipment with the Descent Mk2i.

• ☐ Confirm compatibility with the Descent T1 transmitter — if your current transmitter is not compatible, you will need to purchase the T1 separately to use the shared data network.
• ☐ Verify the 1.4 inch screen size — a smaller display than your current model may make reading complex dive logs more difficult during a surface interval.
• ☐ Check the 80-hour dive mode battery life — if your planned excursion exceeds this duration, you will need to plan for a power source or a shorter dive.
• ☐ Budget for the $699.99 price point — failing to account for this cost may result in a budget shortfall when purchasing the watch and required accessories.
• ☐ Confirm the weight of 0.88 pounds — a heavier watch may cause wrist fatigue during long multi-sport sessions or extended periods underwater.

You should not buy this product if your current diving setup relies on a proprietary transmitter that is not the Descent T1.

Performance: What the Specs Deliver

Monitoring Pressure for Up to 5 Tanks via SubWave Sonar

The Garmin Descent Mk2i Titanium with Black Band integrates pressure monitoring on up to 5 tanks via SubWave sonar data network, a system that transmits data wirelessly between the computer and the transmitter. This capability allows you to view remaining air time and air consumption rates for multiple cylinders simultaneously on a single interface. Because the 1.4 inch color sunlight-readable display is designed for underwater visibility, you can confirm these levels even in low-light conditions at depth.

Descent Mk2i supports a shared data range of 10 meters, which defines the maximum distance between the computer and the connected tanks. This range limits how far you can move from your primary gas source while maintaining a live feed of your consumption. If you are diving a complex configuration, ensure your tank placement stays within this 10-meter radius to maintain continuous pressure updates.

Extended 80 Hour Dive Battery

The Descent Mk2i provides up to 80 hours of battery life in dive mode, which is the total duration of continuous power supply during a descent. This capacity supports a full day of snorkeling, providing approximately 32 to 64 hours of usable power for a 12-hour session. For example, you could complete a multi-day expedition where you spend 12 hours on the water each day without needing to recharge the unit between sessions.

While the 80-hour dive capacity is substantial, the battery holds 15 hours of power in GPS mode with music. This distinction means that while the device handles long underwater durations easily, GPS-heavy surface activities will deplete the power significantly faster than a standard dive. You should plan your surface navigation and music playback to ensure the battery remains sufficient for your planned bottom time.

Smartwatch Features and Fitness Tracking for this Underwater Computer

The Descent Mk2i functions as a smartwatch with a 16-day battery life in smartwatch mode, supporting features like smart notifications for calls, texts, and calendar alerts. It includes pulse Ox sensing of blood oxygen saturation and sleep monitoring to track your recovery and physical readiness. These features allow you to transition from a dive computer to a daily wearable that monitors your health metrics throughout the week.

The device also supports music storage with premium streaming service support, allowing you to listen to playlists during surface intervals or while training. Because the unit includes advanced training features and support for multiple sports apps, it serves as a secondary tool for land-based fitness. This versatility means you can use the same hardware for high-elevation altitude acclimation and daily fitness tracking without switching devices.

The Descent Mk2i Job by Job: What Its Figures Cover

The Descent Mk2i against the jobs buyers ask about, worked out from its listed battery life and a typical need for each job.

New users can learn more in our guide to scuba diving computer terms and specs.

How the Descent Mk2i Compares to Other Subsurface Computers

The Descent Mk2i provides the longest dive mode battery life of the models we evaluated, offering up to 80 hours of power.

• The Descent Mk2i is $50 more expensive than the Garmin Descent Mk2S 010-02403-00.
• The Descent Mk2i offers 50 hours more dive mode battery life than the Garmin Descent Mk2S 010-02403-00.
• The Descent Mk2i is $119.99 more expensive than the Shearwater Research Teric Color Wrist Dive Computer.
• The Descent Mk2i is $210 more expensive than the Garmin Descent G1 010-02604-01.
• The Descent Mk2i ranks 3rd highest-rated of the 6 options based on buyer ratings.

Buyers who prioritize a lower initial price point or the specific Nitrox Trimix support of the Shearwater Research Teric Color Wrist Dive Computer should consider those alternatives instead.

For a more budget-friendly option, see our full review of the Descent G1 Solar.

You might also consider scuba diving computer alternatives for achieving the same results.

How the 1.4 Inch Display Affects the Price of this Scuba Diving Computer

The Garmin Descent Mk2i Titanium features a 1.4 inch color sunlight-readable display that is 36% larger than the previous model. While many scuba diving computer users expect a trade-off between screen real estate and battery life, this model provides up to 80 hours in dive mode and 16 days in smartwatch mode. The 1.4 inch display provides enough room to view the remaining air time and air consumption rate clearly during a descent.

The $699.99 price point sits $160 above the $540 average of the similar scuba diving computer products we compared. At this price, you receive integrated pressure monitoring on up to 5 tanks via SubWave sonar data network, which allows for shared data across a 10-meter range. You should choose the Descent Mk2i if you require the ability to track a long-distance multi-sport triathlon, as the 80-hour dive mode capacity provides enough power for a 20-hour event even at the heavier end of usage.

From Delivery to First Use with This Subsurface Computer

Setting up your Descent Mk2i

You need a compatible Descent T1 transmitter to begin using the integrated pressure monitoring and shared data features.

1. Unpack the watch and the included charging cable.
2. Connect the cable to the watch and a power source to ensure the battery holds its full 80-hour dive mode capacity.
3. Sync the Descent Mk2i with the Garmin Dive app on your smartphone to begin storing dive logs.
4. Pair the watch with your Descent T1 transmitter to enable the SubWave sonar data network for up to 5 tanks.

Warranty and support: what to check

Warranty coverage and return policies vary by seller and country.

• Confirm the screen’s 1.4 inch display is free of defects, as the sunlight-readable panel is the primary interface for your dive data.
• Verify the pulse Ox and heart rate sensors respond to your input, as these are key metrics for your training logs.
• Check that the watch weights 0.88 pounds and fits your wrist comfortably, as the 3.9 inch dimensions are fixed.
• Ensure the music storage and streaming functions connect to your account, as these require specific software permissions.

Perform a full battery cycle test and check the GPS signal for 15 minutes on the day it arrives to confirm the hardware functions before the return window closes.

The Descent Mk2i: Remaining Questions

How many dives can I keep on the watch before it starts overwriting old data?

The Garmin Descent Mk2i stores and reviews data from up to 200 dives. This capacity allows for a substantial history of underwater logs without the need to manually clear entries to make space for new ones.

Is the Garmin Descent Mk2i compatible with the Descent T1 transmitter?

Yes, the Descent Mk2i is compatible with the Descent T1 transmitter, which is sold separately. This pairing allows the watch to receive shared data from up to 5 tanks via the SubWave sonar data network.

How long does the battery last during a dive?

The Descent Mk2i offers up to 80 hours of battery life in dive mode. This duration provides enough power to stay on the surface for a full 12-hour snorkeling trip or to track a 20-hour multi-sport triathlon.

Does the watch show my remaining air time?

Yes, the Descent Mk2i displays remaining air time and air consumption rate. These figures are calculated based on the integrated pressure monitoring and shared data received from connected tanks.

Is the Descent Mk2i Right for You?

Who the Descent Mk2i suits and the jobs it is the wrong choice for, listed below with the reason for each.

Where to Buy This Scuba Diving Computer

When we looked in November 2026, the Descent Mk2i was listed at $699.99 – a snapshot that may have changed since.

Scuba diving computers are sold by the retailers below – we do not track which of them has the Descent Mk2i in stock, so check availability and the current price with the retailer before making a trip.

• REI (online and physical stores) — reliable inventory of major brands and in-store expert advice
• Amazon (online only) — massive selection and easy comparison of consumer models
• ScubaGear (online only) — specialist retailer with deep technical inventory
• Triton Sports (online and physical stores) — specialist retailer with expert staff and technical gear
• DiveInn (online only) — large online catalog for international and domestic brands
• Dick’s Sporting Goods (online and physical stores) — wide availability of mainstream brands and physical locations

Final Verdict on the Descent Mk2i

If you need a watch-style dive computer that manages multiple gas sources and provides high-frequency heart rate data, the Descent Mk2i is a capable choice at around $699.99.

The Descent Mk2i features integrated pressure monitoring on up to 5 tanks via SubWave sonar data network, which allows the device to display remaining air time and air consumption rates for shared data across a 10-meter range. This capability enables you to monitor multiple cylinders simultaneously during a dive.

You can rely on the battery for 80 hours in dive mode, which provides enough power to last through a 20-hour multi-sport triathlon or a 12-hour snorkeling session. In smartwatch mode, the battery lasts 16 days, while GPS mode with music provides 15 hours of use.

The 1.4 inch color sunlight-readable display is 36% larger than the previous model and supports smart notifications for calls, texts, and calendar alerts. It also includes music storage with premium streaming service support and contactless payment functionality.

The Descent Mk2i records and reviews data from up to 200 dives. It includes pulse Ox sensing of blood oxygen saturation, sleep monitoring, and altitude acclimation at high elevations.

You should choose the Descent Mk2i if you require a dedicated dive computer that doubles as a high-end smartwatch with multi-GNSS support and advanced training features. The 4.7 rating from 305 buyer ratings reflects a high level of owner satisfaction with the device’s performance.

Skip it if: You need a dedicated freediving computer with a simpler interface or if you require a device with a larger physical screen than 1.4 inches.