10 inch is a friggn TV,I have the in dash Pioneer 7 inch (cd,radio and weather) and it's to big some times
To me, the single most valuable aid the GPS gives me over a map is the turn-by-turn, including telling me which lane to be for exits, road splits, etc. Aside from that, there are countless other times when a GPS can help in ways a map cannot, such as when a detour or road closure presents itself. Not always time for the co-pilot to choose a new route, even worse when you're driving alone.I do use maps and a Trucker's Atlas for route planning though, as there is lots of information in those to help keep out of trouble spots.