Even before the iOS 6 maps debacle, relying on GPS for guidance in places like National Parks was pretty dumb. There are multiple stories of people getting stranded (and even dying) when relying on maps for places like Death Valley. Often times, even if one is in a suitable vehicle, knowledge of the environment, what to do in case of a problem, etc. are essential necessities in the case of anything going wrong.

A buddy and I travel the back country of Death Valley regularly and the stories we have heard, the vehicles we have seen trying to go places they shouldn't, etc. are just amazing. At a certain point, however, common sense and personal responsibility need to be considered.