Customer reviews from Garmin
Garmin - Descent Mk3i GPS Dive Smartwatch 51 mm Fiber-reinforced polymer - Silver and Black PVD Titanium with Black/Gray Band - (2026)
Average customer rating
4.6
(155 Reviews)
Rating breakdown 155 reviews
5 Stars
122
4 Stars
18
3 Stars
6
2 Stars
5
1 Star
4
Customer Reviews for Garmin - Descent Mk3i GPS Dive Smartwatch 51 mm Fiber-reinforced polymer - Silver and Black PVD Titanium with Black/Gray Band - (2026)
Customer Rating
5
Great upgrade!
on December 27, 2025
Posted by: Andle7
I purchased this to upgrade from my MK1, I am a commercial diver and wear this everyday. I’m extremely impressed by how well it holds up to the rigors of commercial diving. I also use the MK3i for my main dive computer for recreational diving and it has never failed me. This is a great product and I would recommend it to anyone!
Written by a customer while visiting Garmin
Customer Rating
5
Hello MK3i, goodbye ultra2
on December 20, 2025
Posted by: D1v1n
If diving and fitness tracking are your top priorities—or you’re after a rugged, reliable multisport watch with outstanding battery life and complete independence from any smartphone ecosystem—go with the Garmin Descent Mk3i.
It absolutely crushes the Apple Watch Ultra 2 on battery endurance: switching from daily charging on the Ultra 2 to charging just once every 10–25 days (depending on usage) with the Mk3i is a total game-changer for multi-day adventures or dive trips.
The Ultra 2’s reliance on the subscription-based Oceanic+ app felt frustrating—limited interface for anything beyond recreational diving, an ongoing yearly fee, and it just wasn’t up to more technical needs. On top of that, cellular connectivity was unreliable (often failing without the iPhone nearby), and Siri prompts constantly conflicted with my phone.
I also added Garmin’s Index smart scale and Index BPM blood pressure monitor to my setup—they integrate seamlessly with the Mk3i via Garmin Connect, making it effortless to log workouts, track recovery, and monitor overall health metrics in one place.
The Mk3i is packed with so many advanced features (air integration, diver messaging, superior depth rating, and pro-level training tools) that I genuinely wish I’d switched from Apple sooner—it’s built for serious use without the constant hassles.
It absolutely crushes the Apple Watch Ultra 2 on battery endurance: switching from daily charging on the Ultra 2 to charging just once every 10–25 days (depending on usage) with the Mk3i is a total game-changer for multi-day adventures or dive trips.
The Ultra 2’s reliance on the subscription-based Oceanic+ app felt frustrating—limited interface for anything beyond recreational diving, an ongoing yearly fee, and it just wasn’t up to more technical needs. On top of that, cellular connectivity was unreliable (often failing without the iPhone nearby), and Siri prompts constantly conflicted with my phone.
I also added Garmin’s Index smart scale and Index BPM blood pressure monitor to my setup—they integrate seamlessly with the Mk3i via Garmin Connect, making it effortless to log workouts, track recovery, and monitor overall health metrics in one place.
The Mk3i is packed with so many advanced features (air integration, diver messaging, superior depth rating, and pro-level training tools) that I genuinely wish I’d switched from Apple sooner—it’s built for serious use without the constant hassles.
Written by a customer while visiting Garmin
Customer Rating
1
Horrible watch! Did not work and just locked up!
on November 16, 2025
Posted by: Stapes
I would not buy this watch. After diving with 11 guys for a week the best answer is a the Apple Watch Ultra. The Apple Watch Ultra can function as a dive computer using the built-in Depth app and the Oceanic+ app. The Depth app automatically launches when submerged and tracks depth, time, and water temperature, while the Oceanic+ app provides more advanced features like dive planning and decompression information, requiring a subscription for full functionality. Just works!
Written by a customer while visiting Garmin
Customer Rating
5
Great watch
on November 7, 2025
Posted by: flanagan4dr
I purchased this watch as a dive watch, adventure race watch, and a running/open water swimming watch. I have been very impressed with the watch after a month of use. It is easy to see underwater and can be customized in so many different ways to display what you want to see underwater. Battery life is awesome! I am very happy with this watch, and still learning more everyday on what this thing can do.
Written by a customer while visiting Garmin
Customer Rating
5
Best battery life I've ever had on a smartwatch!!!
on October 31, 2025
Posted by: TheOceanAstronaut
This thing just goes and goes! 25 days of battery life on a full charge. Gone are those days where I used to have to take off my watch every 3 to 4 days to charge it up. The greatest thing is it actually is a smartwatch and not just a dive computer. It shows messages can pay by tap, and a whole host of workout and physical condition information. Government is the best company! Now they just need to make a quality smartphone!
Written by a customer while visiting Garmin
Customer Rating
5
Couldn’t live without my MK3i
on October 30, 2025
Posted by: Lostwon
I only have great things to say about my MK3i. The watch and Garmin ecosystem have fundamentally awoke my fitness and health awareness. I appreciate the direction we are heading with wearable tech. One thing that I can attest to without any doubt is the absolute quality of the glass. I beat this watch up daily and have yet to scratch or crack the glass. The raised bezel does its job exceptionally well.
Written by a customer while visiting Garmin
Customer Rating
5
Best sports watch for divers ever!
on October 27, 2025
Posted by: Cwhig
I bought this over a months ago and I enjoy ever single day! So many things you can use it for besides diving, especially if you work out or doing anything active. The charge on the battery is insane it lasts forever. I have a teric and a perdix which are great dive computers but that’s all they are. I use this garmin for biking, swimming , working out and everything I try to do. Totally love it.
Written by a customer while visiting Garmin
Customer Rating
5
Has more features still learning what it can do.
on October 20, 2025
Posted by: dddjr58
bought it for diving it is great and not complicated have many others this one is the one
Written by a customer while visiting Garmin