4" Fishfinder screen w/ 7 vivid color options to see fish and structure in maximum contrast. Built-in Sonar - GT20 transducer to get Garmin CHIRP traditional sonar and CHIRP ClearVu scanning sonar. Waypoint Marking - mark hot spots so you can easily find your way back. High Sensitivity GPS - plan and create routes and view boat's speed. Quickdraw Contours - store up to 2 million acres of maps. IPX7 Waterproof construction. Dimensions: 3.9" x 6.9" x 1.8". Includes: GT20-TM Transducer. Power/Data cable. Tilt/swivel mount. Hardware.