Echo Sounder
My transducer is fitted forward of the keel underneath forward V birth.
Anything which forms a medium between transducer & bilge without any air bubbles.
They use glycerine in pressure gauges to prevent needle shock.
Linseed oil is a transmitting medium on engineering / technical terms
Castor oil
I have just bonded mine to the hull. I believe nut oil has the best consistency.
I took the easier option of just gluing my transducer to the inside of the hull with west epoxy.
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