Garmin GPSMAP 78 1.7MB marine GPS navigator has new modeled rubber side grips, high sensitivity GPS receiver, microSD slot for loading additional maps, built-in worldwide basemap and 1.7MB of map storage space. Garmin GPSMAP 78 also supports BirdsEye Satellite Imagery upon subscription to download satellite images in your device and integrate them with the maps. Garmin GPSMAP 78 floats in water and IPX7 waterproof.