The all new GPSMAP 78 series were developed specifically with the marine user in mind. They feature crisp color mapping, a high sensitivity receiver, new molded rubber side grips plus a microSD slot for loading additional maps. All units come with a built-in worldwide basemap so you can navigate with anywhere with ease. Built-in tide tables give you time and tides based on the nearest tide reporting station to the location you designate in the U.S. They have easy-tomark waypoints, GOTO function, and Man Overboard (MOB). Adding more maps is easy with Garmin's wide array of detailed marine, topographic and road maps available on microSD cards. City Navigator NT map data gives turn-by-turn routing on roads. The card slot is located inside the waterproof battery compartment for protection.

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