Just got the Mega.Have any of you used the base map and had good results with auto chart live overlay. Maybe this is the way to go. Id still like to see a few pictures of the Mega xducer mounted on the back of an aluminum boat. I also have a SI transducer question. I know the beam is a thin slice. But how thin is it. Id like to know if its going to shoot straight down and to the sides. Will it be able to shoot between my transom and foot. Do you have a picture of the beam or know of a link I can go to so It can be a little more clear to me.