Garmin echoMAP chirp 73Cv chartplotter has 7-inch color display with keypad control, includes transducer with high wide chirp and chirp ClearVü, preloaded LakeVü HD maps cover 17000 total lakes of which 13000 are HD lakes with 1-foot contours shore to shore, includes Quickdraw contours custom HD map creation software, internal 5 Hz GPS updates position and heading 5 times per second.