Going back to Nav lectures in 1969, we were told of a case in WW2, or just after, in the RAF where a Nav training flight set off from Tripoli to fly due south for a hundred miles, do a 180 and return. Off they went, did the 180 and stooged back. At the subsequent enquiry as to why they had landed in the desert out of fuel, the flying crew mentioned that they had charts over the windscreen for the south bound flight to keep out the sun and no one thought to question why they needed to be still in place on the northern leg. Compasses and gyros were not that reliable in those days.
"I learned about flying from that"