Garmin Descent G1 vs Mk2S

Both are Garmin dive watches running the same dive software, but the [Descent G1](https://scubadownunder.com/gear-reviews/garmin-descent-g1-dive-watch) is the rugged-value option at around AU$599 and the [Descent Mk2S](https://scubadownunder.com/gear-reviews/garmin-descent-mk2s) is the premium one at around AU$1,400 that adds air integration, mapping, music and a metal build. For most recreational divers the G1 is the smarter buy. The Mk2S earns its premium only if you specifically want those extras.

## At a glance

- **Same dive software:** both run Buhlmann gradient factors and the same core dive modes - **Air integration:** Mk2S only (via Garmin's transmitter); the G1 has none - **Maps and music:** Mk2S has TOPO maps and onboard music; the G1 has GPS waypoints only - **Display:** G1 is monochrome; the Mk2S is colour with a metal bezel - **Price:** G1 around AU$599; Mk2S around AU$1,400 - **Best for:** G1 is the value pick for most divers; Mk2S suits those who want air integration, maps and a premium build

## The two contenders

The [Garmin Descent G1](https://scubadownunder.com/gear-reviews/garmin-descent-g1-dive-watch) is a lightweight, rugged dive watch with a monochrome display, GPS and full smartwatch features. The [Garmin Descent Mk2S](https://scubadownunder.com/gear-reviews/garmin-descent-mk2s) is the smaller-cased member of Garmin's premium Mk2 line, with a colour display, a metal bezel, TOPO mapping, onboard music and support for air integration. Both run Buhlmann ZHL-16C with gradient factors and both work as everyday smartwatches.

## Display

The G1 has a monochrome, always-on memory-in-pixel screen: not flashy, but sharp, sunlight-readable and very efficient. The Mk2S steps up to a colour memory-in-pixel display, which makes maps and data more legible and simply looks more premium. Underwater both are clear; topside the Mk2S is the nicer screen.

## Dive features and air integration

This is the main reason to step up. The Mk2S supports wireless air integration through Garmin's Descent transmitter, so you can read tank pressure (and even a buddy's, with multiple transmitters) on the wrist. The G1 does not support air integration at all. Both share the same broad set of dive modes, so on pure decompression and gas handling they are evenly matched; the Mk2S simply adds the air-integration layer on top.

## Maps, music and navigation

The Mk2S carries full TOPO mapping, multi-band GNSS and onboard music storage, so it works as a serious adventure and trail watch as well as a dive computer. The G1 has GPS for marking entry and exit points and tracking workouts, but no downloadable maps or music. If you want one watch that maps a hike and stores your playlist as well as logging dives, the Mk2S is the one.

## Build and size

The Mk2S uses a 43mm case with a metal bezel, a genuinely premium, compact unit that suits smaller wrists well. The G1 is a slightly larger, lighter fibre-reinforced polymer watch built to shrug off knocks. Both are comfortable for all-day wear; the Mk2S feels more like a premium watch, the G1 more like a tough tool.

## Battery

Both deliver excellent battery life thanks to their efficient displays, easily covering a dive trip plus everyday use. The G1's simpler monochrome screen gives it a slight edge in standby, but neither will leave you hunting for a charger mid-trip.

## Price and value

This is the deciding factor for most divers. The G1 costs less than half the Mk2S while running the same core dive software and offering the same smartwatch basics. Unless you specifically want air integration, mapping or music, the extra spend on the Mk2S buys features many recreational divers never use. That makes the G1 the value champion and the Mk2S a considered upgrade.

## Common ground

Both are Garmin dive watches that run identical decompression software, work as full everyday smartwatches with heart rate and activity tracking, and sync to Garmin Connect and Garmin Dive. Whichever you choose, you get the same trusted diving brain and the same daily-wear convenience. The Mk2S simply layers air integration, mapping and music on top, so the choice is about how much of that you will actually use.

## Which should you buy?

Buy the [Garmin Descent G1](https://scubadownunder.com/gear-reviews/garmin-descent-g1-dive-watch) if you want a rugged, do-everything dive watch at the best price and you do not need air integration or maps. It is the right call for most recreational divers. [Check the G1 price on Amazon AU](https://www.amazon.com.au/dp/B09RQZX4C3?tag=scubadownun08-22).

Buy the [Garmin Descent Mk2S](https://scubadownunder.com/gear-reviews/garmin-descent-mk2s) if you want air integration, TOPO maps and music in a premium compact watch, and the higher price is no obstacle. [Check the Mk2S price on Amazon AU](https://www.amazon.com.au/dp/B08K2RRCKP?tag=scubadownun08-22).

Thinking about the flagship instead? See our [Garmin Descent Mk3i vs Mk2S](https://scubadownunder.com/gear-reviews/garmin-descent-mk3i-vs-mk2s) comparison, or weigh the G1 against Shearwater in [Peregrine vs Garmin Descent G1](https://scubadownunder.com/gear-reviews/shearwater-peregrine-vs-garmin-descent-g1).