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 3-axis compass, barometric altimeter, crisp color mapping, a high-sensitivity receiver and 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 imageryperfect 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. Get your bearings. GPSMAP 78sc has a built-in 3-axis, tilt-compensated electronic compass that shows your heading even when youre standing still or not holding the device 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,