Safely navigate open waters, Kayak, Stand up paddle SUP, Dive or any Watersport * Handheld Marine VHF Radio/GPS with Digital Selective Calling (DSC) No Base Required * Rechargeable Battery will last many years just recharge a minimum of one time every six months * Built in 20 parallel channel GPS - waypoints can be downloaded to Google Earth via included USB cable * Floating - Depth rated to 425 feet