Yes, forget GPS. Navigation is just plain old commonsense. Think, don't try to do a maths exam in a rattling steel cabinet. Once had a co-pilot insist that I fly a heading of 310 departing Singapore for Australia. He had cocked up the INS ( pre GPS gadget ) data entry, but was prepared to follow the winking lights, regardless. Think.
Had an old Nav. instructor suggest that I mentally climb outside the aircraft, pretend it was a model aeroplane that I was pushing over a map - which way you gonna turn, lad
Having said forget GPS - I recently needed another 'distance from' whilst flying a microlight ( LSA actually ) towards controlled airspace, couldn't be bothered re-programming the panel mounted one, so took a handheld one out of my pocket. Had to smile, I used to navigate 707's with a sextant, and here I was using 2 GPS's - in a microlight !! How the World has changed.