How can I restore factory settings ? My fishfinder had been operating normally. , when I removed it from my boat. When I put it back on the boat , and turned it on , it shows the water depth to be 60 ft. even though the boat is still on the trailer. It reacts to movement under the boat , OK , but as I recall , it never showed such an erroneous water depth before. The fishfinder is an Eagle Cuda 168 , serial # 100784790 . Thanks Larry