M_Boats: Super deal on Raymarine stuff

Hi folks: Re M15 and installing a fish-finder. I've tried to find some info. on our site and the most reassuring( to me, that means no hole in hull) is from Randy Graves posted Dec.27/08. Of particular interest is location of the sensor.Randy, if you or anyone else has tried placement aft of the centreboard,I'd much appreciate learning of your success. As I discovered this past summer on L. Superior, rocks and "Li'l Nan" don't mix!