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Details:It comes standard with a built-in worldwide marine basemap and accepts MapSource BlueChart offshore marine cartography featuring detailed depth contours, inter-tidal zones, wrecks, navaids, and many other points of interest. For small-water anglers, the GPSMAP 172C is compatible with MapSource Recreational Lakes with Fishing Hot Spots featuring fishing areas, boat ramps, marinas, and hazards for hundreds of popular U.S. and Canadian lakes. Pre-programmed data cards can be easily inserted into the slot on the front of the unit.
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