Garmin Descent Mk2i Dive Computer Review

Torben Lonne
By
Hunter Bierce
Staff writer at DIVEIN.com
Consummate amateur and true master of none, Hunter specializes in throwing himself in over his head and figuring it out along the way. Beginning his career...
Torben Lonne
Editor and Co-founder at DIVEIN.com
Torben traveled to South East Asia for scuba diving and never really stopped his search for new adventures. His affinity for gear that works and his...
Video preview
GARMIN Descent™ Mk2 & Mk2i FULL [IN-WATER] REVIEW – We took the Garmin Descent MK2i Diving
DIVEIN tester wearing the Garmin Descent Mk2i over a wetsuit sleeve with a bungee secure strap fitted
As a dive computer, the Garmin Descent Mk2i performs better and has more features. But could the Apple Ultra be the Garmin killer?
Our reviewer holding the Garmin Descent G1 Solar beside the larger Descent Mk2
Side by side the split is size, not capability. The Mk2 wears like a proper instrument, while the G1 Solar is the one most divers would still have on at dinner.
Three Garmin Descent Mk2 dive watches side by side showing the compass, gas setup and dive mode screens
We took the Mk2i in the water for a full review. As a dive computer it has more features than the Apple Watch Ultra, which is the comparison everyone keeps asking about.
Garmin Descent Mk2S dive watch in light gold showing depth 87 ft, dive time and heart rate
The Mk2S is the small-wrist take on the same platform. As a dive computer the Mk2i still performs better and carries more features, so the choice is fit against function.
Garmin Descent Mk2i dive computer watch with black band showing a coastal map on its color display
Full color mapping on the wrist is where the Descent Mk2i still pulls ahead of a smartwatch trying to moonlight as a dive computer.
Garmin Descent Mk2 showing a digital compass heading of 125 degrees above the no-deco time and depth readout
Putting the compass on the same screen as depth and no-deco time saves a wrist swap mid-dive. Navigation stops being a separate piece of kit you have to carry.
Garmin Descent Mk2 dive mode menu listing single-gas, multi-gas, CCR, apnea and gauge options
Rebreather and apnea modes on a watch this size are still uncommon. Most divers will live in single-gas, but the spread means the Mk2 keeps up as you train further.
Garmin Descent Mk2 in dive mode showing air as the gas, water temperature, no-decompression limit and depth
Gas, temperature, no-deco time and depth all land on one page. Legibility at depth is where watch-sized computers usually fall down, and this screen does not.
Garmin Descent Mk2 screen showing a saved dive plan for the MS Zenobia with depth, time and gas columns
Plans are built and stored on the watch itself, nitrox mixes and ascent stops included, so you are not stuck fiddling with a phone app on the boat.
Garmin Descent Mk2 dive watch shown at an angle on white, with a silver bezel and black silicone strap
In watch mode the Descent Mk2 passes for an ordinary outdoor watch. That is half the appeal for divers who do not want a second device on the wrist every day.

Where to buy

We went diving with the new Garmin Descent Mk2i. This is a cool dive computer with a user experience that was clear to see and use before, during and after the scuba dive. The amazing multi-sport functionality is truly impressive – both for the amount of activities and the depth of info.

Backcountry skiing, sailing (with integrated tide charts), skydiving and kayaking are some of the crazy amounts of activities this machine is designed to track.

Expectations were high after the success of the original Descent Mark One, which seemed to come pretty close to hitting the sweet spot between a dive computer and an everyday smartwatch. The upgraded functionality of the Mk2i both as a dive computer and as a multisport smartwatch overcame our initial skepticism.

The bling in the Mk2 is the addition of the SubWave network on the Mk2i (the “i” stands for integration), a sonor-based communication technology that increases range and signal strength underwater. This revolutionary system pairs with the T1 transmitter providing advanced air integration and ultra accurate air pressure of up to 5 gas-mixed tanks (ni-tri- and 100%-ox), dive time remaining, and consumption rate.

What’s amazing is the ability to read the same data on other scuba divers within a 10 meter range. An instructor might like to know their students’ time remaining while underwater, but this info is generally more interesting for post-dive deep-diving.

With new decompression and safety stop upgrades to better provide fast and accurate info for ascending, the Mark 2 improves diver safety.

About this review

To help you find a Dive Computer that will fit your needs, we’ve tested, researched, and reviewed the best ones available today.
We test both in the water, diving in various conditions - and in our lab - so we can give you accurate answers on quality, performance, and the overall value.

Read about our test of Dive Computers

Recommended in: Dive Computer

Things we like:

  • Both a recreational and technical dive computer
  • Usability/functionality is great
  • Subwave sonar technology on Mk2i integrates tanks 30 feet away
  • GPS and maps
  • Fully functional fitness watch with over 60 sports
  • Elegant and comfortable to wear

Things we don't like:

  • Expensive, especially since transmitters cost extra
  • Only comes in a large 52 mm

Garmin Descent Mk2i

Video preview
GARMIN Descent™ Mk2 & Mk2i FULL [IN-WATER] REVIEW – We took the Garmin Descent MK2i Diving

It’s clear that Garmin has put improvements on the Mk2 that appeal more to technical divers than the first Descent provided, but this is still apparently a dive computer for primarily recreational divers. It’s limited to 100 meters, so tech divers using different gas mixtures can monitor them all, but an instructor may find it more useful to have real-time data of 4 other students plus their own at once. Of course, that will require the Mk2i and buying extra T1 transmitters which will go on sale sometime closer to New Year’s.


Garmin Descent Mk2 screen showing a saved dive plan for the MS Zenobia with depth, time and gas columns
Plans are built and stored on the watch itself, nitrox mixes and ascent stops included, so you are not stuck fiddling with a phone app on the boat.

Beyond the air integration feature with SubWave technology that only the Mk2i has, the only other difference is that it has a titanium bezel and backplate, whereas the Mk has stainless steel.

Like the Mark 1 apnea diving and closed-circuit rebreather-modes are available on an even-better 1.4 inch display. With the Garmin Dive app finding dive spots with entry/exit points is useful, as is the preloaded dive data for wrecks reefs and tide data. Just look on the app for a new spot, mark it and your Mk2 will show you the way.

As a dive computer and smartwatch, the suite of apps (Garmin Dive, Garmin Connect, Garmin Golf, Garmin Explore and Garmin IQ) demonstrate its applications topside as a multisport GPS watch, the likes of which they have been making with a lot of success over the years (check out the Fenix series).


Garmin Descent Mk2 dive mode menu listing single-gas, multi-gas, CCR, apnea and gauge options
Rebreather and apnea modes on a watch this size are still uncommon. Most divers will live in single-gas, but the spread means the Mk2 keeps up as you train further.

Of the available apps for topside activities, the addition of color maps for over 42,000 golf courses worldwide is impressive and appeals to a leisure segment, while runners, hikers and climbers will appreciate the altimeter, as they did on the Mk1.

New on the Mark 2 is the ability to store and listen to music, and having all the smartwatch features like an NFC pay system (Garmin Pay), a pulse oximeter to measure blood oxygen levels and telephone notifications (call, text and calendar) make this a truly exciting cross-over.

The display is a third bigger than the Mk1, having a screen size to show all these activities. And yet, the new Descent is not bulky to have on. Quite the contrary.


Garmin Descent Mk2 in dive mode showing air as the gas, water temperature, no-decompression limit and depth
Gas, temperature, no-deco time and depth all land on one page. Legibility at depth is where watch-sized computers usually fall down, and this screen does not.

With a solid battery life (16 days in smartwatch mode, up to 80 hours in dive mode or 32 when paired with the T1) and assuming the SubWave ecosystem lives up to the hype, the Mark 2 seems to have provided a wristwatch unlike anything else on the market, save its predecessor.

Take it on an expedition with the GPS running up to 35 days; go running with music playing for 15 hours (if you’re an ultra runner, for example); or go diving for a whole weekend without ever having to take it off for recharging.

Let’s recap Garmin’s latest splash by examining their first foray into diving with the Descent Mark 1.


Where the Mk1 Shined

Garmin Descent Mk2 showing a digital compass heading of 125 degrees above the no-deco time and depth readout
Putting the compass on the same screen as depth and no-deco time saves a wrist swap mid-dive. Navigation stops being a separate piece of kit you have to carry.

The Descent took the idea of a wrist-worn dive computer to truly bridge the gap to something that was also a smartwatch with everyday applications like health tracking. The touchscreen user interface is much more akin to a smartwatch than to the sometimes clunky layout of a dive computer. Impressive battery length and all the other features you would expect to find in fitness-based smartwatch

Despite all of its other features, the Descent is still a dive computer at heart. Between such features as the built-in plan mode, adjustable salinity settings, automatic altitude adjustment, and compatibility with up to six gasses in a single tank, the Mk1 is one of the most well-rounded contenders in the dive computer market.

In spite of its achievements as a reliable computer, the biggest highlight of the Mk1 is its navigational capabilities. Both underwater and on the surface, the Descent functions up the hard-won Garmin standard. This should come as no surprise given their legacy as a leader in wearable GPS.

The Descent Mk1 was a modest success, impressive given that it was Garmin’s first attempt at making a dive computer. But it wasn’t without criticism. Rumors abound that Garmin considered feedback from expert divers very seriously, that is now brilliantly reflected in the recently released Mk2 and Mk2i.


Garmin Descent Mk2i dive computer watch with black band showing a coastal map on its color display

Specs & Features

Color Black
Display type Color display. Memory-in-pixel (MIP)
Display size 1.4 inches (35mm)
Screen resolution 280 x280
Battery Rechargeable. 16 days in smartwatch mode
Computer size 2.05 × 2.05 × 0.71 inches( 5.2 x 5.2 x 1.8 cm)
Depth rating 330 feet (100m)
Number of gasses 11 deco and/or backup gasses
Dive modes air, nitrox, trimix, gauge, apnea, apnea hunt, freedive
Alarms visual and audible
Dive log capabilities Up to 200 dives with sharing via the Garmin Dive app
Transmitter compatible yes
Weight 3.51oz (99.6g) with silicone strap
Number of buttons five
Compass yes
Wrist straps black silicone or titanium
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3 Comments
Ana
Ana

I currently have a Suunto D4i but while I’m working it significantly cuts my dives short (routinely have to leave a dive with 1200+ psi in my tank on nitrox). I know Suuntos are one of the most conservative on the market and I’m looking for a much more liberal computer. How does this shape up on the scale from most liberal to most conservative?

tomin
tomin

Hi
can you clarify please on the reasons not to buy? first time amateur open water diver here !

Team Member
Reply to  tomin

Hi Tomin. You should consider whether you want a sports watch or a dive computer when reading this: The first reason might be, because it’s a heck of a lot of a machine at a higher price. It has amazing applications in so many different areas of active living, including for health, but it costs quite a bit. So, for a first time diver who doesn’t need the technical aspects of this watch (nitrox, etc) other options might be more compelling. on the other hand, if you’ve contracted the diving bug and have your sight set on serial scuba diving, you won’t be disappointed with what the Mk2 & Mk2i can do. On top of that, it’s great for freediving and almost any other sport on land and water. It also has health advantages. We’re currently testing the Apple Ultra which does similar things but has the Apple ecosystem involved.
The second reason would be the size. If you’re planning on using it as an everyday watch, and the battery makes it less charging-dependent than Apple’s, then it can seem really big. That size makes the screen nice to read under the water, but it has a bigger footprint on your wrist.
So, consider if you want to invest in it based on your appetite for diving. Otherwise, the Mk2s and G1 Solar are worth looking at. The G1 is prefered by some members of our team because it’s less bulky and more typical watch like.