VINTAGE RAYTHEON DE725C FATHOMETER DEPTH FINDER Explorer III. You are bidding on a vintage Raytheon depth finder/fathometer! Model 725C. Knobs are in place. Some scratches around the metal casing. Head unit only. Explorer III. Being sold for parts or repair only since we have no way to test it. Measures 12" wide, 6.5" high and is 5.5" deep. Really nice looking fathometer/recorder by Raytheon!!