Save Price Garmin GPSMAP 421s 4-Inch Waterproof Marine GPS and Chartplotter with Sounder

GPSMAP 421S Chartplotter Combo - Includes Dual Frequency TransducerFeatures an ultra-bright 4" QVGA display along with an improved high-speed digital design for faster map drawing and panning speeds. Plus these waterproof units have a high-sensitivity internal GPS receiver so mariners will always know their position at sea. They are ready ...