I'm installing upper helm instrumentation including a depth sounder this week (Humminbird 600). I remember reading an archived thread some months ago in which it was suggested that a piece of PVC pipe be glued to the hull to create a dam in which the transducer would float in a pool of mineral oil. I haven't been able to re-locate that thread, so would like to check my "facts". Is that really all there is to it? The transducer simply floats without being secured in any way? Is the pipe capped to prevent the mineral oil from possibly sloshing out, or just left long enough to contain the oil in the event of turbulence? 6"? Cheers, Garrett President 41

E16@telus.net writes: >Is that really all there is to it? The transducer simply floats >without >being secured in any way? I once owned a Hinterhoeller (sail) that had a PVC pipe (6" long, 2"diameter) epoxied to the hull and the transducer sitting in it in a bath of mineral oil - no cap provided, never leaked. Worked like a charm. Now on a different boat I have a transducer glued to the inside of the hull (at a reasonably flat area) with GE Silicone and it works just as well. Good luck, George of Scaramouche