The rugged GPSMAP 78 features crisp colour mapping, high-sensitivity receiver, rubber side grips, plus a microSD card slot for loading additional maps. What' more, for boaters and watersports enthusiasts, this unit is waterproof. Available with a built-in worldwide basemap, it makes reaching any destination a breeze. No matter where you are located, in the midst of deep canyons, the woods, or the city, the GPSMAP 78 offers all the help that you need to find your way.