Troubleshooting Depth Sounder
I have a Garmin 198C Sounder chartplotter that came with the boat (a Cal 39) when I bought it in 2006. The depth sounder function started to fail intermittently last spring, and by mid-summer it completely stopped working. The chartplotting function still works fine. I canít find any troubleshooting information in the owners manual. I have tried contact cleaner on the two cables that plug into the back of the unit, but that didnít help. The boat was out of the water recently for other work, and I had hoped the spraying down of the hull would clean the transducer, but that didnít help either. Does anyone have suggestions on how to troubleshoot the problem?