Out of interest, how do commercial pilots navigate?
Certainly in the Airbus I navigate by entering the route into the computer and allowing the autopilot to follow the magenta line, there are checks done to ensure that what I have entered is correct and we have a paper log to back it up.
What I also have though is the basic skills that, if all that failed I would still be able to work out where I was going - and that started with what I learnt during my PPL training!
To me there is no argument against GPS once you have learnt the basics, it is
replacing the basics with GPS that I disagree with.