I don't see what is wrong in using a GPS as a primary navigation aid. It is very common in the USA.
I always draw my route on a map along with the wind and the radio frequencies that I need on route marked in the places I need to talk to people.
I then fly the course using the the map and GPS and radio nav aids as a back up. If the GPS signal fails (the unit is mains powered 196 with battery backup) then I just carry on with "conventional" navigation.
A stopwatch and ruler are out of the arc, I think pilots should learn about GPS as an aid to navigation as part of the basic PPL. I think GPS in combination with a map would save a lot of controllers the headaches caused by airspace busts and lost pilots. GPS is an excellant aid to situational awareness.
Of course the loss of the GPS signal in this case could be attributed to a broken wire...............
