The GPSMAP® 276C is a color chartplotter and automobile navigator. This portable GPS navigator features a 256-color TFT display that's easy to read in bright sun along with a built-in basemap and auto routing to provide you with turn-by-turn directions to the marina for a day of boating. On water, it is a color chartplotter with a built-in Autoroute basemap enhanced by Garmin's marine cartography. It accepts pre-programmed or user programmed data cards with MapSource® and BlueChart®. GPSMAP 276C supports external NMEA sources for water depth, water temperature, and water speed through two serial interfaces. The unit also features a new Course Deviation Indicator (CDI). The CDI quickly indicates if a boat has veered off course.On land, the GPSMAP 276C’s American or European Autoroute basemap features interstates and major highways. The unit is also powered by a rechargeable lithium-ion battery pack or a standard 110-volt AC plug. 3.8-inch diagonal, 480 x 320 pixel, 256-color TFT screen with adjustable LED backlight. Water resistant to IEC 60529 IPX7 standards (submersible in one meter of water for 30 minutes).