On my last boat, I mounted it inside and it worked great. You *may* need a
different type transducer though...read the instructions.

If you want to mount it inside, it's best to test a few locations first to
see what works best. I did this by filling the bilge w/ enough water to
cover the unit, then I weighed it down with some ankle weights. Go cruising
and see how it works. If need be, move it to a new location and try again.
Once you find a nice spot, mark it and pump out the water. Mounting it is
done with SLOW set epoxy, and a large amount of it. It's important that you
use slow set (4 hrs or longer) as it will release any air bubbles caught in
the mix during the slow curing time. If there's any air between the
transducer or the hull, accuracy will suffer or it won't work at all. That
is why you need to submerse it in water in the bilge while testing.

Hope that helps a bit.

--Mike

"Melandre" wrote in message
ups.com...
Inside??? Isn't it supposed to touch the water somehow? Does the
accuracy suffer? The boat has a fiberglass haul: it is just your
typical 18" Bayliner runabout with I/O Mercruiser... Nothing fancy.
Andre