In my experience, people who don’t just buy a GPS unit despite getting lost a lot, even though they may claim they can’t afford the $100, are usually scared of having to master yet another techno-gizmo. But the better GPS brands have really worked hard on user interface, and today a base model Tomtom is no harder to use than an ATM. And this man is a photographer, for crying out loud. If he can handle a professional camera, he can handle a GPS.
(Of course, if the caller’s VW bus is one of the very old ones with a 6V electrical system, and if it was never converted to 12V, it would take a little ingenuity to install a modern GPS unit.)