I thought for years I had a technical job. I can't even make my simple Lowrance color unit GPS work. I have to have it PLUS a handheld RINO 130. Humminbird 768 on the TM has GPS too, and sadly, can't figure that out either. Usually I'm working way too hard to catch my limit (my limit = 4) to worry with fiddling with electronics. If it finds brushtops, I'm happy.