The Garmin GPSMAP® 78SC has all the features of the GPSMAP 78s plus it comes with built-in BlueChart g2 coastal charts and a worldwide basemap with imagery. Map detail includes shorelines, depth contours, navaids, harbors, marinas and more for the US and Bahamas.Ideal for use around water, the GPSMAP 78 Series is IPX7 waterproof and even floats! With the high-sensitivity, WAAS-enabled GPS receiver and HotFix satellite prediction, GPSMAP 78 Series locates your position quickly and precisely and maintains its GPS location even in heavy cover and deep canyons. Adding more maps is easy with the microSD card slot which is located inside the waterproof battery compartment, so you don’t have to worry about getting it wet. In addition, the GPSMAP 78 Series supports geocaching GPX files for downloading geocaches and details straight to your unit. They store and display key information, including location, terrain, difficulty, hints and descriptions, which means no more manually entering coordinates and paper print outs! Simply upload the GPX file to your unit and start hunting for caches. Includes wrist strap, USB cable, and manual.