This next generation of marine-friendly GPS handhelds offers a new contemporary industrial design with rubber side grips that's ideal for navigating the great outdoors. The bright, highly transflective 65K color LCD display with backlight is easier than ever to read and use in all conditions. Features a high-sensitivity GPS receiver with HotFix for quick position calculations and a soft-key user interface in a rugged, waterproof housing that floats. The GPSMAP 78s has a 3-axis tilt-compensated electronic compass. Supports wireless exchange of tracks, waypoints, routes, and geocaches with compatible Oregon, Dakota, Colorado, and Foretrex devices. A built-in worldwide shaded relief basemap comes preloaded. Includes 1.7GB of internal memory and a microSD card slot for adding optional map data. Stores up to 2,000 waypoints and 200 routes. Operates up to 20 hrs. on two AA batteries. Weighs 7.7 oz.