It is exactly what I mean. That "early" (cold war era and maybe later) spy planes, strategic bombers, cruise missiles and even ICBMs used stars to navigate.

And, oh, yes, all ships before last century, too, of course. So it is more spiral than circle :)

Neat, this latest implementation seems a little more compact than the SR-71's, but it's hard to tell.

https://timeandnavigation.si.edu/multimedia-asset/nortronics...