Garmin 010-01101-01 GPSMAP 721xs without Transducer Includes Worldwide Basemapbr Click below to buy on Amazon: br Super-fast 10 Hz GPSGLONASS br Advanced Sonar Support- Built-in support for a wide selection of Garmin transducers including 50200 kHz 77200 kHz DownVu and SideVu scanning sonar and CHIRP In addition it will also support Minn Kota and Motor Guide trolling motor transducers br Add the Clearest Scanning Images on the Water - Add the optional GCV 10 black box sonar to enjoy Garmin DownVu and SideVu scanning sonar with the clearest scanning sonar images on the water br Special Features for Sailing - Supported sailing features include lay lines enhanced wind rose heading and course-over-ground lines true wind data fields and tidecurrenttime slider br Get Your Apple Device Onboard with Blue Chart Mobile