A little off topic but I have the same unit with transducer mounted on the transom and am having trouble with it loading my maps. I have lake master maps and when I turn my unit on it will not pull them up. The only I have found to get it to work is go into setting and change map source to unimap, wait a minute and the. Go back and change it to auto then it will finally load? Sometimes it takes several minutes anyone else have this problem? Not trying to hi jack your thread.