Unit is a Garmin 198C Sounder Well, I've been having trouble with the connector at the back of the unit, so I cleaned both sides out good with dielectric grease. I was very happy to have the power solidly connected with GPS not going out when the connector was wiggled. I even heard the transducer clicking. I couldn't wait to get out on the water with the unit working again! In the water, however, the sonar does not work. It clicks away on the trailer, but stops sounding as soon as it hits the water. The transducer looks fine to me. There is no physical damage beyond a few scratches. Has anyone else experienced this? Why would water contact stop the transducer from sounding?