Explore both of your worlds, underwater and topside, with Descent Mk2 the watch-sized dive computer. It features multiple dive modes, such as single and multiple gas dives, gauge, apnea, apnea hunt and closed-circuit re-breather. The Descent Mk2 comes with ABC sensors with an underwater 3-axis compass as well as surface GPS capabilities to mark your entry and exit points(GPS tracking does not work underwater). On land, Descent Mk2 doubles as a premium multisport GPS smartwatch with multi-GNSS support, multiple sports apps, wrist-based heart rate monitoringestimates, Pulse Ox(this is not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition)sensor, advanced training features, Garmin Pay payment service(not all countries and payment networks are eligible), music storage, smart notifications(when paired with a compatible smartphone) for calls, texts and calendar alerts and more.