On Tue, 28 Mar 2006 10:19:09 GMT, "Roger Long"
wrote:

Excellent point on the range. I'd forgotten that might be important to
many people. I only worry about the last few feet, myself.

The range effect comes into play in other ways. I used to sail in a
shallow bay where the bottom was mostly very soft mud, which doesn't
return a particularly strong signal. With an internal transducer, I
often lost the signal entirely until I got back over hard sand. To be
sure, it was a crummy installation: one of those plastic bubbles
filled with mineral oil and the transducer monted at the top. I think
the transducer mounted directly to the hull would have been better.
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