The 10 inch color Garmin GPSMAP 1040xs keyed chartplotter/sonar combo has preloaded BlueChart g2 and LakeVu HD maps. It includes advanced 77/200 kHz HD-ID and Garmin DownVu with a CHIRP-technology all-in-one transducer for a nearly photographic view under your boat. The 1040xs supports an optional 50/200 kHz transducer and is CHIRP compatible and also supports GCV 10 black box sonar, which adds both DownVu and Garmin SideVu scanning sonar with CHIRP technology (sold separately). Built-in 10 Hz GPS/GLONASS receiver updates your position and heading 10 times per second. The GPSMAP 1040xs can also wirelessly connect to Apple iPhone or iPad for Garmin Helm or BlueChart Mobile.