I got the 788ci HD DI combo hooked up yesterday and started tooling around through the menus and screens. Was really interested to see wha tkind of detail the preloaded map (Humminbird Contour XD) had to it.

I can't get it to show contour lines at all. I had it set to show "All" detail and then moved my little cursor over to the lake I fish to see what I could see. All I saw was a white lake with no countour lines.

Any advice on how to remedy this? I am about 90% sure it is operator error on my part but I have searched and searched through the electronic manual and didn't locate a fix.