Garmin GPSMAP 441s 4-Inch Waterproof Marine GPS and Chartplotter (Without Transducer) 4-inch LCD display Garmin GPSMAP 441S chartplotter/fishfinder combo; Garmin GPSMAP 441s gps chart fishfinder combo Brand new garmin GPSMAP 441s without transducer Frequency = none | internal/external antenna = internal Built-in sounder Preloaded with U.S. coastal area map data Garmin GPSMAP 441S chartplotter/fishfinder combo Garmin GPSMAP 441s gps chart fishfinder combo Brand new garmin GPSMAP 441s without transducer Frequency = none | internal/external antenna = internal