On Thu, 05 Jul 2007 10:28:55 -0400, "Reginald P. Smithers III"
wrote:

I have heard that it is tougher to get clean water with a transom mount.
I have always just shot thru the glass, because it is only a depth
finder, and not a fish finder, I have never had a problem.

I'm shooting through the glass on my trawler with good results,
typically on soundings up to 1500 feet of water, and one less hole in
the boat.