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The GPSMAP 182/182C feature crisp, high-resolution displays and high-speed processors, which allow for an extremely fast redraw rate. These chartplotters have a built-in WAAS receiver, which means they can pinpoint your location and other map features within three meters, on average.The GPSMAP 182/182C's built-in worldwide basemap provides coastline detail, U.S. tide data, and inland cartography. The detail gets even better when you plug in an optional data card with GARMIN's exclusive BlueChart marine cartography or detailed maps from our MapSource product line. Like all GARMIN marine products, these units are tough enough to stand up to saltwater, sunlight, and other elements.