The GPSMAP 78s is meant for marine and watersports use and features a barometric altimeter, three axis electronic compass, hypersensitivereceiver, crisp 65k color mapping and a microSD card slotfor additional maps. The rugged, floating unit features a built-in three axis electronic compass that is tilt compensated so it displays your heading even if you stand still without keeping it level, perfect for sailing through those heavy seas.
You can also share maps, tracks, waypoints and routes with other compatible devices wirelessly as well as export files for viewing later. Adding maps is a breeze with the wide range of Garmin’s topographic, marine and road maps, which are available on microSD cards. Also, as the card slot is located within the waterproof battery compartment, you don’t have to worry about it getting wet. Most important, the device supports export of files for easy sharing, like with us at TracksEdge so that we can help you display your ocean adventure of a lifetime. Overall, a great unit for marine use!