High performance, rugged marine GPS with US g2 coastal charts, 3-axis compass, barometer and more!For boaters and watersports enthusiasts who want to run with the best, the rugged GPSMAP 78sc includes preloaded U.S. coastal charts and features a three-axis compass, barometric altimeter, crisp color mapping, a high-sensitivity receiver, new molded rubber side grips, plus a microSD card slot for loading additional maps. And it floats!Explore Coastal Waters: GPSMAP 78sc comes with built-in BlueChart g2 coastal charts and a worldwide basemap with imagery — perfect for all your outdoor pursuits. Map detail includes shorelines, depth contours, navaids, harbors, marinas and more for the U.S. and Bahamas. And, like the rest of the 78-series, 78sc is IPX7 waterproof and even floats in water.Get Your Bearings: GPSMAP 78sc has a built-in three-axis tilt-compensated electronic compass, which shows your heading even when youre standing still, without holding it level. Its barometric altimeter tracks changes in pressure to pinpoint your precise altitude, and you can even use it to plot barometric pressure over time, which can help you keep an eye on changing weather conditions.Share Wirelessly: With GPSMAP 78sc you can share your waypoints, tracks, routes and geocaches wirelessly with other compatible device users. Now you can send the location of your favorite fishing spot to a friend to find. Sharing data is easy. Just press send” to transfer your information to similar units.Keep Your Fix: With its high-sensitivity, WAAS-enabled GPS receiver and HotFix satellite prediction, GPSMAP 78sc locates your position quickly and precisely and maintains its GPS location even in heavy cover and deep canyons. The advantage is clear — whether youre in deep woods or just near tall buildings and trees, you can count on GPSMAP 78sc to help you find your way when you need it the most.Add Maps: Adding more maps is easy with our wide array of detailed marine, topographic and road maps, available on microSD card. Conveniently plug in BlueChart g2 preloaded cards for a great day on the water or City Navigator NT map data for turn-by-turn routing on roads. The card slot is located inside the waterproof battery compartment, so you don't have to worry about