Hello Max,
This is all in French but it is quite simple!
Bienvenue sur le site du Bureau d'Enquêtes et d'Analyses - the sixth document down
Basically, they don't think that GPS comes for free
An analysis of some accidents where the BEA (the French acident investigators) consider that GPS has been a great distraction in the cockpit (for one thing) and that pilot's have capitulated in front of it in other cases, blindly following it when they perhaps would have done something else had they still been doing it manually.
I know, probably statistically tenuous (not many accidents) and also because there is no evidence to support the other side of the argument (how many people have been saved by GPS, how many people have crashed because they had no GPS) but interesting reading anyway!
So, I'm happy and comfortable with my maps (batteries have never failed yet!)
Cheers and happy landing to you!