Of course, anyone can stick a GPS in a car, boat, plane and follow it. Batteries die and dead reckoning nav via compass or sky (sun/stars) is a skill everyone should learn and practice. In fact, geocaching is even more fun without a gps, using only a compass and a map. You pretty much only need to know where you came from and where you want to end up.
Not to steal Gershon's thunder, but car bodies, electronics, phones, all effect a compass if close enough. You can put a compensated compass in your car to counter that. Things like zippers, jewerlry, watches, not so much unless your compass is right on top of it.