garmin striker 4 3.5" chirp fishfinder gps (010-01550-00) with protective cover garmin 3.5-inch chirp fishfinder with gpseasy-to-use 3.5-inch color fishfinder with built-in, high-sensitivity gpsfind fish; mark and return to hot spots, docks and rampsconvenient keypad operationincludes 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)&nbsp;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).experience the clarity of chirpstriker 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, 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 ran...