Thanks Bill and Howard, I do have the boat shaped transducer, probably much like Howard's. It could be the silicone I used (clear), not as rubbery as the white stuff that I think Howard used. But after the silicone (sporadic reception) and silly putty (no reception) the puck alone in the water only seemed to work about half the time. I called Garmin Technical Support yesterday who said it sounded like a main unit/cable/transducer problem that must be checked out before they would know for sure what it is. After going around a few times about not wanting to undo my four hours of cable installation, the fellow agreed that they could determine the problem by just checking the main unit. If the unit is bad, they will replace it. If the unit is good, they'll replace the cable/transducer. Thanks for the help guys. Rick Langer M15 #337 Bluebird