Lowrance iFinder H20 C 2.83-Inch Waterproof Marine GPS Comes with dual processors for higher speed screen updates and scrolling; sporty styling and a sure-grip rubber welt seal Features a built-in background map, including interstate exit services, of the continental United States and Hawaii Includes one MMC/SD digital media memory card slot for mapping and recording capabilities, an antenna port for connecting the optional external GPS Dimensions: 5.6 x 2.5 x 1.2 inches (W x H x D); weighs 8.7 ounces 16-channel GPS and WAAS-enabled handheld helps get you where you're going quickly and easily