I agree with the most of the responses posted. When we plan a LONG trip, we first use map quest to look at the overall planned directions and routes that will best get us to our destination. Then we look at an Atlas, then obtain paper maps and outline the route. When on the road, we follow our outlined written directions, using the GPS to help us with necessary lane changes, turns ect. Now if the GPS deviates from our maps, we follow the maps until the GPS changes the route to coincide with our original mapped out route.