I didn't actually say that I thought you were anti GPS.
But you wouldn't be able to safely and reliably do the job some of us are doing without it. You might try, but if you can't use beacons where there are no beacons! It's almost impossible to squeeze through some of the airspace gaps we are required to use, often on an ad hoc basis, at low levels, if you can't self navigate.
I see you have edited your post #16.
Try navigating under the London CTA, say from Biggin Hill to Barton.