Before the days of FMS in the FunBus, if off-airways and out of ground-based navaids, one relied on the skill of the directional consultant...
One of who was the late 'Admiral Zig-Zag' (RIP). Thoroughly nice chap, whose nickname resulted from an exchange tour as whatever they call flight commanders at BRNC Dartmouth....but his heading changes were often rather large, shortly followed by equally large corrections in the opposite direction. In a second aircraft we once followed the Admiral from ASI, whereupon our nav announced that we were heading 30 deg in the wrong direction - it was later discovered that the Admiral had fat-fingered the next waypoint and it hadn't been cross-checked.... So not all his fault that time.
As one captain once said after a flight with the Admiral "Doesn't he know a number smaller than 20?"
So on a double-crewed jaunt to the Pacific, it was agreed that the first tourist would navigate from McClellan to Hickam, while the Admiral would navigate back - on the grounds that America was a bigger target than Hawaii, so he'd probably be able to find it.
But, as I say, a really nice chap - and one of the few Flt Cdrs honest enough to admit that his professional skills weren't perhaps the best.