Thanks for the reply. I will give it another try and see what happens. I fish Lake Erie and want a decent unit that I can rely on. I have always had Lowrance and this is the first Hummingbird I have used. If I continue having problems with my Hummingbird 788C, I will be getting a new unit, either a Lowrance Elite 7 or possibly a Hummingbird with a 7 inch screen. Lowrance is offering a $100 rebate on the Elite 7 until June 15th.