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Extra bonus points : if you get above the cloud cover, can also use constellations to correct accumulated errors.

I heard some Russian ICBMs had a special window so that cameras can see constellations for that purpose.




And the SR71 had it from the start, too.

http://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird#Astro-...

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Oh wow, this is why I keep coming back to HN again and again. Thank you for teaching me something amazing!

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