Garmin GPSMAP79SC Handheld GPS With Sensors Built-in BlueChart G3 CoastalMeet the Garmin GPSMAP 79sc Marine Handhelda rugged, floating navigator built for mariners and outdoor explorers who need dependable positioning, built in sensors, and coastal charting on the go. Rugged, floating design: IPX7 water rating and a buoyant body that stays afloat if dropped overboard. Preloaded BlueChart g3 Coastal Charts: Detailed coastal navigation data right out of the box. Worldwide basemap with map expansion: Base mapping included