On a long trip, I can really see the benefit of GPS in a big way. You don't want to lug along paper maps of an entire cross-country trip if you can help it...instead, if road touring, I'd just pick up a paper road map of my current state and rely on GPS for the rest. If off-road touring, I'd want the topo maps for my current area, but mostly just rely on GPS...but also have a state map, compass and lots of batteries just in case.