Garmin has expanded its premium dive lineup with the Descent Mk3i in 51 mm form, a device built for divers who want more than a standard smartwatch. The new model combines advanced dive tools, underwater communication, and everyday wearable features in a single premium package.
What sets it apart most is Garmin’s SubWave sonar system, which allows preset messages to be sent underwater to compatible devices at distances of up to 30 meters. That capability places the Descent Mk3i in a category aimed at serious diving use, while still keeping the familiar smartwatch platform intact.
Built for demanding underwater conditions
The Descent Mk3i 51 mm uses a titanium case in silver and black, giving it a rugged but refined look. Garmin pairs that construction with a 1.4-inch AMOLED display protected by sapphire crystal, along with a 20 ATM rating that supports diving up to 200 meters.
Those specifications matter because underwater gear has to handle both visibility and durability challenges at the same time. Garmin appears to have designed the watch to feel closer to professional dive equipment than to a conventional daily smartwatch.
Underwater messaging and team coordination
The headline feature is the SubWave sonar function, which lets divers send preset messages without surfacing. Garmin says the communication range reaches 30 meters, making it useful for short and practical exchanges during a dive.
When used with the Descent T2 transceiver, the watch can also monitor tank pressure and depth. In that setup, it can track up to eight divers within a 10-meter radius, which adds another layer of coordination for group activities underwater.
Dive tools for a wide range of use cases
Garmin equips the Descent Mk3i with support for multiple dive styles, including single-gas and multi-gas modes. It also covers Nitrox, Trimix, freediving, apnea, gauge mode, and closed-circuit rebreather diving.
The watch also includes DiveView maps with depth contours and more than 4,000 dive sites. That makes it more versatile for divers who need planning tools, location data, and underwater navigation support in one device.
Readiness, navigation, and safety features
Beyond dive mode itself, Garmin adds tools meant to support preparation and safety before entering the water. The Descent Mk3i can estimate dive readiness by looking at sleep quality, stress, and activity levels.
It also includes a dive compass, surface GPS, variometer, and real-time no-decompression limit data. Together, those features are meant to help divers stay oriented and make better decisions while underwater.
Battery life and daily smartwatch use
Battery performance is another major part of the appeal. Garmin says the Descent Mk3i can last up to 66 hours in diving mode, while smartwatch use stretches to 25 days, or around 10 days with always-on display enabled.
That kind of endurance gives the device flexibility for users who want one watch for both intense diving sessions and regular day-to-day wear. It also supports Garmin’s positioning of the model as a hybrid between a dive computer and a premium smartwatch.
More than a dive computer
Outside the water, the Descent Mk3i stays packed with standard smartwatch features. Garmin says it offers more than 80 sports apps, along with heart rate tracking, VO2 max, Pulse Ox, sleep tracking, and training suggestions.
It also includes music storage, contactless payments, smart notifications, and 32 GB of internal memory. The watch is listed at €1,599.99/US$1,599.99 and shown with shipping available in a matter of days, indicating that the 51 mm version is already positioned for sale in select markets.
