I stuck the outboard boat style transducer to the inside of my sailboat hull
with a BIG gob of silicone RTV caulk, works good, but only to ~350'. I
stuck it in the wet caulk and it worked, otherwise I would have cleaned up
the wet caulk and tried something else. That transducer was included with
the Garmin 100 Blue fishfinder, which is a great unit with NMEA output that
I view on my chartplotter. A "puck type" transducer would cost almost as
much as the fishfinder!
Lee Haefele
wrote in message
ps.com...
Thanks for your replies. I have a Grady-White that has lots of foam in
the hull with one thin area in the stern (as noted by the
manufacturer). Placing a transducer there yields a clear bottom scan
with a thin line at the surface (the hull) that doesn't seem to mess up
the readings to a noticeable degree.

All I really want is some assistance in avoidance of running aground in
the tributaries of Chesapeake Bay where I fish. Looks like this method
will work for me and minimize the bubble risk with epoxy.

Thanks again.