Garmin Descent Mk3i 51mm Smartwatch Dive Computer (Silver/Black PVD Titanium)Featuring SubWave sonar based communication and diver monitoring, the Descent Mk3i is an advanced, air integrated dive computer and smartwatch comes with Garmin innovations to help prepare you to make the most of your diving experience, plus multi sport training and smart features for your active life out of the water. Air Integration & SubWave Sonar Networking Pair with Descent T2 transceivers (sold separately) for integrated pressure monitoring on