Unlike regular fishfinders, STRIKER fishfinders have built-in, high-sensitivity GPS to locate your current position quickly and precisely, then maintain your GPS location anywhere you go on the lake. More importantly, they allow you to mark spots where the fish are biting so you can return to them again in the future. You also can mark docks, boat ramps and other locations on the lake. Just follow the path created on your screen to return to them whenever you wish. Since the STRIKER fishfinder series includes high-sensitivity GPS, you can see your position in relation to waypoints you have marked.