A friend of mine flew a Piper Aztec in severe clear daylight (in other words not a cloud in sight the whooe way) at FL100 (10,000 ft) from Heraklion (Crete, Greece) to Tel Aviv with no GPS or inertial nav equipment on board. Without using any conventional nav techniques (none of that sextant business), how did he find his way? Specifically, how did he know he was on the airway?
I'm an occasional pilot (right seat) and he put the same question to me. I didn't work it out - he had to tell me. It's incredibly obvious though! The giveaway is the clear daylight weather, but remember the entire way was flown over water, so he wasn't following railway tracks or anything! Answers please!!