3.5-inch CHIRP Fishfinder with GPS Easy-to-use 3.5-inch color fishfinder with built-in, high-sensitivity GPS Find fish; mark and return to hot spots, docks and ramps Convenient keypad operation Includes CHIRP (77/200 kHz) sonar transducer; transmit power (200 W RMS)/(1,600 W peak-to-peak) Upgrade to high performance CHIRP with a GT8 or GT15 transducer (each sold separately) Finding fish is easier than ever with STRIKER 4 fishfinder. Mark and return to your hot spots, boat ramps and docks, and share your favorite waypoints and routes with other STRIKER and echoMAP™ combos. Smooth Scaling™ graphics provide uninterrupted imagery when switching between depth-range scales. Sonar history rewind allows you to scroll back through sonar images to mark waypoints you originally may have missed. Plus, it has a built-in flasher and displays speed data. Includes tilt/swivel mount, CHIRP (77/200 kHz) transducer with transom and trolling motor mounting hardware and cable. For high-performance CHIRP, purchase a GT8 or GT15 transducer (each sold separately).