My contention is that if 'steam powered' navigation were dropped from the PPL syllabus tomorrow and everyone received proper instruction on how to use a moving map GPS (including how to update the data base etc.) navigation errors, airspace intrusions etc. would drop by a factor of 10.
Yes, I know about the unreliability of the signal, all those jamming trials, the need to rely on Uncle Sam and all the rest of it, but it's not as if string and stopwatch navigation is exactly 100% reliable is it?
It's a no-brainer.