Garmin 010-01181-00 GPSMAP 840xs Chartplotter/Sonar Combo with DownVu Transducer Keyed chartplotter/sonar combo with 8-inch color SVGA display Preloaded U.S. LakeVu HD and Blue Chart g2 coastal maps Built-in Garmin HD-ID and supports CHIRP and DownVu scanning sonar with CHIRP technology High-sensitivity internal 10 Hz GPS/GLONASS receiver Supports all Garmin marine radar