Sorry Shaggy but here's another seriously worrying post for you.
I agree with DSC.
GPS should be primary nav and visual should be last resort after radio nav.
Pilots got lost all the time pre GPS and also did a lot more infringing. There was just a lot less fuss about it in the old days because it "went with the territory". It's far less acceptable these days precisely because of GPS and not in spite of GPS.
I've never flown a glider but if I absolutely had to navigate solely by mark 1 eyeball and stopwatch, then I would rather do it in a powered aircraft with a pre determined and pre planned flight plan and a marked route with waypoints than by simply careering around the sky in an unpowered glider looking for thermals and trying to just stay up in the air whilst wondering where the hell I am as I go around in circles.....