Garmin echoMAP 74sv with Transducer echo MAP sv series offer all of this plus SideV scanning sonar for the clearest images to the sides of your boat. 5 Hz Internal GPS updates position and heading 5 times per second to make marking and returning accurately to waypoints easier Coordinates the timing of the sonar return with your boat's position and saves digital information for playback on a computer using FREE Homeport planning software. quick-release mount - Cables plug directly into the mount allowing for you to quickly install and remove your device from power and mount. Includes: echo MAP 74sv with U.S. Blue Chart g2, power/data cable, Y-cable adapter (12-pin to double 4-pin), quick-release mount, flush mount, protective cover, GT41-TM transducer (50/200kHz/DownV/SideV, 12-pin), hardware, documentation