Garmin Descent Mk3i 51 mm Dive Computer and Multisport GPS Smartwatch

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Product guide

Garmin Descent Mk3i 51 mm Dive Computer and Multisport GPS Smartwatch

Smartwatch: The Garmin Descent Mk3i 51 mm combines a watch-style dive computer with multisport GPS features. Its 1.4-inch AMOLED display, dive modes, mapping and health-tracking features suit divers who want a single wrist-worn device for underwater use and everyday training.

At a glance

Multiple dive modes are listed for recreational and technical scuba diving and freediving.
SubWave supports preset diver-to-diver messages up to 30 metres with software version 15.70 or later.
Monitoring tank pressures and depth for up to eight divers requires a separately sold Descent T2 transceiver and has a stated 10-metre range.
DiveView maps include bathymetric contours and more than 4,000 dive sites.
Built-in LED flashlight offers red or white light, variable intensities and strobe modes.
GPS tracking does not work underwater. An underwater compass is included among the navigation sensors.
Health and wellness features include wrist-based heart rate, sleep monitoring, respiration tracking and Pulse Ox. Garmin says the estimates are not medical data, and Pulse Ox availability varies by country.

Price

$2,099.99Save 20%

Reference price: ~~$2,609.99~~

Price checked: Nov 13, 2026

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Often bought together

Garmin Descent™ T2 Transceiver with Subwave™ Wireless Communication | Monitor Up to 8 Tanks When Under Water, Pair with Your Compatible Air-Integrated Descent™ Dive Computer (Sold Separately)

$729.99

Pros and cons

Pros

Combines dive-computer functions with multisport and fitness features for use on land and underwater.
The dive log can store and review data from up to 200 dives on the watch.
An onboard flashlight and dive-site mapping add practical tools for low-light conditions and orientation.

Cons

Tank-pressure and group-depth monitoring depend on purchasing the separately sold Descent T2 transceiver.
Diver-to-diver preset messages require software version 15.70 or later.

Technical specifications

12 specifications

Identity
Brand	Garmin
Model	Descent™ Mk3i – 51 mm

Display
Screen size	1.4 inches
Screen technology listed	AMOLED

Connectivity and controls
Wireless connection listed	Bluetooth
Control methods listed	Push Button

Power and battery
Battery type	Lithium Polymer

Dimensions and form
Form factor	Round
Dimensions listed	5.1 x 5.1 x 1.6 centimetres
Weight listed	165.9 g

Materials and protection
Water resistance listed	Waterproof

Storage
Storage listed	32 GB

What to know before buying

Listing details to confirm

The listing identifies a 1.4-inch AMOLED screen and describes a 200-metre dive-rated case, while its general water-resistance field only says “Waterproof.” The listed 1.5-metre water-resistance depth and IP68-or-higher rating do not match that dive-rating description, so confirm the intended protection specification before relying on it. The listed 66 milliamp_hours battery capacity is not accompanied by runtime figures. GPS does not track underwater, SubWave messaging requires software version 15.70 or later, and tank monitoring requires the separately sold T2 transceiver within the stated range.

What’s in the box

Included

Descent Mk3i 51 mm watch, carbon gray DLC titanium with black silicone band
Black extra-long adjustment strap
USB-C to clip charging/data cable
Documentation

Who is it for?

A good fit for

Divers seeking a wrist-worn computer with multiple scuba and freediving modes, a dive log and dive-site maps.
Active users who want dive functions alongside GPS, sports apps and health-monitoring features.

Less suited to

Buyers who need tank monitoring or group dive support without purchasing a separate Descent T2 transceiver.
Anyone requiring GPS tracking underwater or treating wellness estimates as medical measurements.

Garmin Descent Mk3i 51 mm Dive Computer and Multisport GPS Smartwatch · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 165 ratings

5 stars88%88%
4 stars2%2%
3 stars1%1%
2 stars3%3%
1 star6%6%

Customer feedback highlights versatility, display brightness, battery life, design and usefulness for diving. These impressions align with the listed AMOLED screen, dive modes and multisport features, but the listing provides no battery runtime figures to contextualize battery-life praise. Feedback on durability is mixed, so buyers who prioritize long-term wear should weigh that uncertainty rather than assume consensus.

Positive themes

Customers describe the device as versatile and appreciate its bright, colourful display.
Customers also speak positively about battery life, design and its usefulness for divers.

Mixed feedback

Customer feedback expresses differing views about durability.

Frequently asked questions

Does the Descent Mk3i track GPS underwater?

No. The listing explicitly says GPS tracking does not work underwater. It describes GPS use on the water and an underwater compass for dive navigation.

Can it monitor other divers' tank pressure on its own?

No. Tank-pressure and depth monitoring for up to eight divers requires a separately sold Descent T2 transceiver. The stated monitoring range is 10 metres.

What is required for diver-to-diver messages?

The listing says SubWave preset messages are available with software version 15.70 or later, with a stated range of up to 30 metres.

Is the listed water-resistance information consistent?

No. The page describes a 200-metre dive-rated case but also lists a 1.5-metre depth and an IP68-or-higher rating. Confirm the applicable protection details before purchase.