On Wed, 17 Sep 2003 21:07:21 GMT, "Doug Kanter"
wrote:

1) No matter what manufacturers say, there are some boats on which it is
seemingly impossible to find a location where the transducer will be happy
at high speeds. The question really is how many holes do you want to drill
in your boat for the sake of experiment? On mine, I used some existing holes
to attach a piece of scrap wood. I drilled a million holes in that while
experimenting with location, and then used it as a template for the final
holes. Even so, above a certain speed I get an accurate depth reading, but
the thing doesn't see fish.

2) Inside mounting: You need a totally different transducer for that, and if
Zercom is like Garmin (the brand I bought), an inside transducer will only
work in a fiberglass boat.

Back to #1: Find someplace on your transom to attach some wood temporarily,
and build some sort of jig that allows you to move the transducer around.
Don't forget that distance from the prop(s) isn't the only factor. The depth
of the transducer matters, too.



The dealer actually advised me to mount it inside the hull (it is an
fiberglass boat). But then again, he advised me also some other things
which didn't work.

The boat is an deep-V. I cannot mount it on the side because of the
trim plates. I do have a couple of questions:
How far should the puck stick out below the bottom ?
Should the the puck be straight (parallel with the bottom) or should
it be mounted at a slight angle ?

I really appriciate your input, this issue seems to be one of these
things which rely more on experience and experiment than on exact
sience.