My mom refuses to use a GPS and spends an inordinate amount of time studying her atlas before she goes anywhere. I plug the address in to a GPS do a quickie once over on Google maps and roll. I always get to where I need to go with the GPS though it may not have always been the best route. OTOH, I don't know of any engineers that use an old reliable slide rule over a calculator that has batteries that might die when they need their calculator the most...