Did you lose the tranducer, the part mounted under water? If so, many of the same Garmin transducers are compatible with other garmin units. For instance, the transducer from my Garmin GPSMap 135 Sounder works with my Garmin Fishfinder 160. Call Garmin. They may not service the unit, but they probably sell the parts. They can also tell you which transducers are interchargable. BrianW