People think navigating an aircraft over unfamiliar territory is like driving to the supermarket. It's not - even with navaids, things look "different" up there. Not to mention that you are a little busy flying the plane and monitoring the engine(s).
That's why I get so pi$$ed when people want to shoot down private planes that stray over some imaginary line in the sky. It happens.
Morning snopercod. Lot of hard work went into navigating in those days. No GPS and beacons for you to follow to the target.
I used to wonder how it could be so difficult til the Foxhole readers explained it, now I know. :-)