Lowrance HDS-5m 5-Inch Waterproof Marine GPS and Chartplotter (With Nautic Insight Maps) Compact chartplotter with internal 16-channel GPS+WAAS Antenna and 5-inch SolarMAX Plus display Built-in Nautic Insight covers the Great Lakes and U.S. coastal waters with life-like views of underwater topography Super sensitive 16-channel internal GPS antenna with faster time-to-signal lock and precision position, for high-definition GPS and mapping Ethernetworks and NMEA 2000 performance networking options available, including broadband sounder Large Selection of Chartcard Options Including Navionics Platinum+ with TurboView