With CHIRP sonar technology, Garmin's echoMAP CHIRP 73dv Sonar/GPS Combo with LakeVu HD provides greater sensitivity, improved target resolution and superior noise reduction on the water for clearer, more easy-to-see images of both baitfish and game-fish targets. 77/200kHz HD-ID™ and CHIRP DownVü™ transducer transmits depth, imagery and water temperature almost instantly. 5Hz internal GPS updates your position and heading five times per second to make marking and returning to waypoints effortless. 7" color display sports intuitive controls for customizing your setup. Pre-loaded with LakeVü HD maps covering over 17,000 lakes, of which over 13,000 have 1-ft. contours shoreline to shoreline. Supports Panoptix™ all-seeing sonar (transducer sold separately). Also supports Minn Kota® and MotorGuide® trolling motors with integrated transducers. Auto Guidance 3.0 capable. Micro-SD slot for additional mapping. Includes transom and trolling-motor mounts.