sdianel wrote:
it's not about accuracy, it's about flexibility. Rather than following the GPS which may take you over 2 lane windy mountain roads, you can stay on major highways by using an Atlas or take shortcuts that others have recommended. I also use online mapping like Google Maps and Mapquest. Online maps and GPS's have 2 options - shortest or fastest routes. Sometimes you need a combination of both. Also RV settings on GPS's use truck routing which takes you out of the way sometimes resulting in more mileage.
This is exactly why you should plan your trip out, and not blindly leave it up to the GPS to route you around. The GPS is a tool, a wonderful tool, but it can be misused just like any other.