The marine-grade Garmin GPSMap 78 is buoyant/waterproof and is operated via the buttons on the front. Many features distinguish this Garmin GPSMAP 78 unit, including the birdseye view, satellite images and raster maps, lots of memory (1.7 GB internal memory) for GPS data etc., cordless data exchange and USB. It also has a 2.6 inch, 160 x 240 pixel, transflective screen. It can be used in many applications and is compatible with BlueChart marine charts, raster maps, satellite images, Citynavigator street maps and topographic vector maps. Paperless geocaching and photo navigation is possible and there are 2,000 waypoints, 200 routes, 200 tracks. It can also record up to 10,000 points. Weight: 218 g incl. 2 (rechargeable) AA batteries. Size: 6.6 x 3 x 15.2 cm.