Customer reviews from Garmin
Garmin - Descent Mk3i GPS Dive Smartwatch 51 mm Fiber-reinforced polymer - Carbon Gray DLC Titanium with DLC Titanium Band - (2023)
Average customer rating
4.6
(150 Reviews)
Rating breakdown 150 reviews
5 Stars
118
4 Stars
17
3 Stars
6
2 Stars
5
1 Star
4
Customer Reviews for Garmin - Descent Mk3i GPS Dive Smartwatch 51 mm Fiber-reinforced polymer - Carbon Gray DLC Titanium with DLC Titanium Band - (2023)
Customer Rating
5
Impressive
on September 19, 2025
Posted by: christopherkosseff
I had a MK2i for 5 years. This is a nice improvment. The screen is wonderful.
Written by a customer while visiting Garmin
Customer Rating
5
A learning curve- But I like it.
on September 14, 2025
Posted by: Markha
I dive quite a bit, and this will simplify my back up dive computer & health monitoring, exercise recording.
Written by a customer while visiting Garmin
Customer Rating
5
Garmin Mki3
on September 9, 2025
Posted by: Wavefinder
I bought this a few weeks ago, so far it has been the best and most comfortable watch I’ve had so far. Easy to navigate and upgraded from a tactix Bravo. Activities I tested so far with it: running, swimming, snorkeling, and diving. Battery life is insane, future content coming soon on my IG account @saltwater_discipline
Written by a customer while visiting Garmin
Customer Rating
5
on September 8, 2025
Posted by: Patrick D
I love this to help me lose weight. The Garmin family is amazing. Best all in one dive computer I have.
Written by a customer while visiting ExpertVoice.com
Customer Rating
3
A Powerhouse Watch with One Glaring Weakness
on September 7, 2025
Posted by: MoishaLu
Overall, I really want to love my Garmin Descent Mk3i. As a tool for diving and fitness, it's nearly perfect. The GPS is lightning-fast, the build quality is exceptional, and the battery life truly lives up to the hype. It feels like a rugged, capable companion for adventures.
However, for a watch in this premium price range, I have one significant gripe that holds me back from giving a full five stars: the sleep tracking is surprisingly inconsistent.
The core of the issue isn't that it doesn't track sleep at all, but that it often does so inaaccurately and at the wrong times. For instance:
· If I'm relaxing on the couch in the evening, being still while watching a movie or reading, the watch sometimes interprets this lack of movement as me being asleep. This leads to the "sleep" data starting far earlier than it actually does.
· Conversely, on nights when I lie awake for a while, it doesn't always seem to capture that period of restlessness correctly.
· Conversely, on nights when I lie awake for a while, it doesn't always seem to capture that period of restlessness correctly.
The other minor frustration is the somewhat rigid "Sleep Mode" schedule. While I understand the intent is to help with sleep hygiene, I wish it were more of a suggestion than a default. For those of us with irregular schedules, the automatic dimming and Do Not Disturb activation can be a nuisance if you're still active, and while you can adjust the times, you can't easily completely decouple it from the sleep schedule without manual intervention.
The Bottom Line: This is a phenomenal diving and sports watch that feels let down by its sleep tracking features. If your primary focus is on underwater performance, surface activities, and navigation, the Mk3i is arguably one of the best you can buy. But if nuanced, granular sleep analysis is a top priority for you, this might not be the device to meet that specific need. It's a fantastic tool that's unfortunately just okay at tracking rest.
Written by a customer while visiting Garmin
Customer Rating
2
amoled is bad for an outdoor adventure watch
on August 27, 2025
Posted by: Mattttttttttt
I wanted to try the latest garmin watch after wearing the descent mk1 and quatix 7 solar for many years. The previous watches used an e-ink style display with plenty of resolution, perfect visibility in sunlight, and the only battery saving technique I worried about was whether or not to update the display with every second tick.
The mk3i takes several steps backwards with the amoled screen. Sure, the resolution and colors are beautiful, but it doesn't matter because the screen is in power saving mode frequently enough that there is nothing to see when you turn your wrist over (there is a required nightly sleep mode that requires your other hand to turn the screen on to see any output). And when the screen is on under heavy sunlight or with sunglasses on you can't read the output either.
Overall I will sell this one in favor of the Felix 8e with the superior MIP display.
Written by a customer while visiting Garmin
Customer Rating
5
The watch that does it all
on August 25, 2025
Posted by: Cip95
I have had my MK3i for about a year and it does everything I want, need and more. I use it primarily for diving, and it has performed as well as other dive computers I have owned. I also use for mountain biking, heart rate, altitude, hiking and running. As I contiune to explore the watch features I find more and more that I love about it. great buy!!!!
Written by a customer while visiting Garmin
Customer Rating
5
Fantastic Dive and Everyday Watch
on August 8, 2025
Posted by: Kohle K
Having already owned the Fenix 5 and 7X, I was already a fan of the Fenix line. During a dive trip 120' down in the famous "The Pit" cenote in Tulum, my dive computer crapped out. My buddy finned by, the bright, crisp screen of his Garmin Descent Mk3i clearly visible even from several meters away. I ordered one that night!
After wearing it for a year: Fantastic screen, snappy performance, no issues syncing. A marked improvement over previous Fenix watches. Fantastic dive computer that makes it very easy to switch between gases. I use the light daily...it's no gimmick...great for both underwater as a handy light and for everyday nighttime bathroom trips. I would have ZERO hesitation recommending this. Especially if you don't already own a smartwatch and a dive computer, this is a 2-for-1 and solves both needs fantastically. Good job Garmin.
Written by a customer while visiting ExpertVoice.com