Garmin Descent Mk3i
Built for recreational or technical scuba diving and freediving, the Garmin Descent Mk3i dive computer boasts a 200-meter dive-rated case, metal leakproof inductive buttons and multiple dive modes.




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- Features a stunning AMOLED (active-matrix organic light-emitting diode) display with scratch-resistant sapphire lens
- 51 mm size features a 1.4 in. AMOLED display, 51 mm titanium bezel and optional titanium bracelet (titanium bracelet not included)
- 43 mm size features a stunning 1.2 in. AMOLED display and 43 mm stainless steel bezel; sized for smaller wrists
- Dive-first design with 200-meter dive-rated case, metal leakproof inductive buttons and multiple dive modes for recreational to technical scuba diving and freediving
- Enhanced SubWave sonar technology provides the ability to exchange preset diver-to-diver messages up to 30 meters (available with software v.15.70 or later)
- Also supports monitoring of tank pressures and depth for up to 8 networked divers, within a range of 10 meters, when paired with the Descent T2 transceiver (not included)
- DiveView maps offer bathymetric depth contours and more than 4,000 dive sites to help you find where to dive and get oriented
- Multi-band GPS technology provides superior positional accuracy while you're on the surface, letting you mark your entry and exit points; GPS tracking does not work underwater
- Built-in ABC sensors—including a 3-axis underwater compass—help navigate every part of your dive from entry to exit
- Dive logs lets you store and review data from up to 200 dives right on your wrist
- Dive logs automatically sync with the Garmin Dive app on your compatible smartphone, allowing you to share and review data, track gear, post photos, take notes and more
- 51 mm size has an LED flashlight for visibility in low-light conditions—above or below water—bright, steady beam in red or white light; variable intensities; strobe modes
- This dive computer is designed to help maximize your preparation for the physical and mental challenges of diving
- Dive readiness tool, developed by Garmin, shows how lifestyle factors such as sleep, exercise, stress and jet lag can affect your body's overall preparedness for diving
- This helps you make better-informed dive plan decisions (data presented is intended to be a close estimation of metrics tracked)
- Built-in sports apps help support your active lifestyle, offering fitness and training features that provide actionable insights for building strength and endurance
- When you're ashore, the Descent Mk3i supports Garmin Pay contactless payments, music storage and smart notifications to keep you connected; compatible smartphone required
- Get 24/7 health and wellness monitoring with wrist-based heart rate, advanced sleep monitoring, respiration tracking, Pulse Ox and more
- This is not a medical device, and data presented is intended to be a close estimation of metrics tracked; Pulse Ox not available in all countries
- 51 mm battery performance: up to 25 days in smartwatch mode and up to 66 hours in dive mode so you can dive without worrying about battery life and go longer between recharges
- 43 mm battery performance: up to 10 days in smartwatch mode and up to 30 hours in dive mode so you can dive without worrying about battery life and go longer between recharges
Imported.
- 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 satellite systems + multi-band: up to 48 hours (38 hours always-on)
- All 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
- Smartwatch: up to 10 days (4 days always-on)
- Battery saver watch mode: up to 12 days
- GPS only: up to 28 hours (22 hours always-on )
- All satellite systems: up to 20 hours (16 hours always-on)
- All satellite systems + multi-band: up to 17 hours (14 hours always-on)
- All satellite systems + music: up to 6 hours
- Max battery GPS: up to 44 hours
- Expedition GPS: up to 10 days
- Dive mode: up to 30 hours
- Dive mode with air integration: up to 15 hours
Best Use | Scuba Diving |
---|---|
Average Battery Life | 51 MM: Smartwatch: up to 25 days; Battery saver watch mode: up to 31 days; GPS only: up to 76 hours ; All satellite systems: up to 55 hours; Dive mode: up to 66 hours 43 MM: Smartwatch: up to 10 days; Battery saver watch mode: up to 12 days; GPS only: up to 28 hours; All satellite systems: up to 20 hours; Dive mode: up to 30 hours |
Battery Type | Lithium Ion |
Display Size | 51 MM: 1.4 inches 43 MM: 1.2 inches |
Illumination | Luminous Face |
Altimeter | Pressure-based |
Compass | Yes |
GPS/Satellite Detectable | Yes |
HRM Included/Integrated | Yes |
Heart Rate Sensor Type | Wrist-based |
Average Heart Rate | Yes |
Pulse Oximeter | Yes |
Heart Rate Target Zone(s) | Yes |
VO2 Max Estimate | Yes |
Recovery Advising | Yes |
Tracks Steps | Yes |
Pedometer Type | Digital 3-axis Accelerometer |
Pace Alert | Yes |
Interval Training | Yes |
Tracks Calories Burned | Yes |
Water-Resistant Depth | 200 meters |
Pool Lap Recognition | Yes |
Stroke Recognition | Yes |
Sleep Tracking | Yes |
Alarm | Yes |
Time Display | Yes |
Stopwatch | Yes |
Visual Map Display | Yes |
Basemap | Yes |
Preloaded Map | Road / Topo |
Programmable Routes | Yes |
Number of Routes | 50 |
Number of Waypoints | 500 |
Customization | Apps Data Fields Watch Faces Widgets |
Smart Device Notifications | Yes |
Data Exchange | ANT+ Bluetooth |
Compatible Fitness Accessories | Heart Rate Monitor Cadence Sensor Power Meter |
Gender | Unisex |
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Enjoying my Mk3
Just got done using it to dive for 2 weeks in St Lucia and it performed very well. You have to pay attention to start the dive and make sure the gps is on before going in and make sure your arm is out of the water to end,that way it will record you entering and exiting points. It will record your heartbeat if it is touching your skin vs over a wetsuit. Also it’s easier to read on the inside of your wrist
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Great for everyday wear also
I purchased this dive computer a few weeks ago. It has a ton of features that I have not even touched yet. It is a great size for everyday wear and offers a lot of features that a typical watch or a typical dive computer would not offer. it has a fantastic appearance, and I cannot wait to get it into the water.
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Best Dive Computer Fitness Watch Ever.
I had a descent MK1 for years and have upgraded to the MK3 this month. I love that it is a powerful amazing dive computer and I wear it to the gym. As a dive master and technical diver and physical trainer...its perfect. It handles then multiple gases I dive with and provides spot on planning assistance. In addition...it wonderful in the gym.
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Fantastic timepiece
Love the watch. Had the 43 mm but wanted larger. Gave it to wife and bought this. Great dive computer, health apps and watch face combos to fit my mood.
Great Watch and Dive Computer.
I am a scuba instructor so the biggest feature I need is obviously the dive computer. I teach diving to 330’ with rebreathers and helium. That being said I need to put my life on the line and the Garmin is my safety net. It has not do disappointed! The screen is perfect. The battery life is long so it doesn’t need constant recharging. And the apps bring it all together. I want to figure out how to keep the watch screen on all the time, maybe dimmed but visible. That’s probably me though and an instruction book. I would also like to lock the right side buttons so the watch doesn’t trip over to an app by accident. I can’t express how much I love the Descent series of watches/dive computers. I have upgraded from each one and they simply get better and better.
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The battery last forever!
I ordered the galexy ultra watch when it came out and after waiting for ever for Android to make a ultra watch with a watch that was diver friendly i was super disappointed! So i gave that one to my mom and took a chance on the mk3i after watching a few reviews. There is not alot of information about this watch on features that are not dive related. But let me reassure you it does everything the other smart watches do. The notifications music controller... the only 2 things i have found that it lacks is the ability to call due to no microphone and it will not tell me my phones battery level. The other gripe i had is how hard it was to find bands for this. I wanted a nicer titanium band and only really found one..... overall inam happy with it and love being able to go well over a week on a single chage.
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Best watch I ever owned
I've owned several Garmin watches, starting with the first vivoactive, then various Fenix models, the Epix gen 2 and now the MK3i. As a sports enthusiast who enjoys a wide range of activities, including scuba diving and skydiving, this watch truly has everything I need.
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The best smartwatch
I bought this smartwatch a couple of weeks ago and have tried it out while golfing, scuba diving, and mountain biking. I love everything about it! The design looks great, and the screen is super bright.
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Great battery life, supports a lot of activities
The watch is super comfortable, fits pretty nicely, and is easy to put on and off. It doesn’t feel too heavy for the volume. I use it to record my runs, my hikes, and got it to go scuba diving with but haven’t done that yet. The heart rate monitor is pretty good, on par with most others. I got the hrm200 from garmin and it pairs nicely with it. The battery life is phenomenal especially coming from an Apple Watch. It’s easy to forget where the charger even is. (15-20 days easily, even with daily 1h+ activity recording) I have been enjoying their concept of body battery, it has brought some awareness to the need for rest and recover properly to me!

I don't get it, and neither will you.
You must use Garmin Dive to set this up. Adding a face from IQ...not on IOS (Apple). IQ shows the device but is not connected. Garmin says to uninstall and reinstall Dive, Connect, IQ; re-pair through the phone. Nothing works. Two pieces of Garmin software can't talk to each other. Research indicates this has been a known problem for over three years. I just wanted a cool smart watch. Instead, I got a massive headache and hole in my wallet. Trust my life to "just reinstall the software"? Thinking not a good idea.
Thank you for your review and experience with the Descent Mk3i. We would like to discuss this further over email. If you would please email us at product.support@garmin.com.