It will not work thru wood. Usually there is a spot close to the transom in
the bilge that is solid glass for this purpose. Take some water and put
inside the bilge just enough to cover the floor where you want to mount.
Then try the depth finder. This will tell you if it will work before
actually epoxying it down.
> Has anyone had any actual experience with using a navman or similar
> depth transducer within the hull of a half inch thick ply hull that
> has been glassed over?
> If it does work, does it have to be the internal "puck" type, or will
> a normal through hull operate effectively from within the hull?
> I have to urgently install a new depths sounder.