Talking of Nav kit, it was the LORAN which really got me . . . for once in my life, I was sorry for Navs.
That and the dedication required to achieve a three-star fix, teetering on that absurd step (apart from Roger Howe that is).
Min Time Tracks for transatlantic until the arrival of JetPlan, toting around the confuser along with the telephone cradle.
Even I operated laser ring gyro INS with GPS update in later life, stripping away all the magic by telling us where we were rather than where we'd just been.