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Striker 4 FishFinder includes a Garmin chirp 77/200 kHz transducer which provides a visibly higher level of clarity and detail for fish and structure than traditional 77/200 kHz transducers. Instead of sending just 1 single frequency the chirp sends a continuous sweep of frequencies ranging from low to high then interprets them individually upon their return. Since the frequencies provide a wider range of information chirp sonar technology can create crisper fish arches with greater target separation. You also can upgrade to high-performance Garmin chirp technology which provides crystal-clear sonar images with even more remarkable target separation and resolution from shallow to deeper depths. For better fishing bottom contours are more visible even at higher speeds and signal noise can be suppressed at greater depths to provide a more timely interpretation of what’s below. 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 at the waypoints you have marked. Use the waypoint map to easily view mark and navigate to locations such as brush piles stumps and docks. It’s also a great tool for finding your way back to the boat ramp. You can quickly and easily see your boat’s speed on the screen of your striker FishFinder. It’s a great tool to make sure you are trolling at the right speed for the lure you’re using and for a particular fish species. It’s also a good way to tell if you are going at the right speed in wake-controlled areas. Fish vertically with a built-in flasher.