Meet the Garmin echoMAP CHIRP: a sophisticated tool that lets you fish like a pro. It has built-in sonar capabilities to provide you with clear target definition. You get a 9″ color display with a keypad. The device comes preloaded with HD maps, covering more than 13,500 lakes. You can create your own HD maps as well.
The device refreshes your position 5 times per second. Just enter where you want to go, and echoMAP will keep you away from low bridges and shallow water. More information about this product is available on Garmin.