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A comment on What If GPS Stood for “Galactic Positioning System”?. Parent comment

Re:What If GPS Stood for “Galactic Positioning System”? by tomalpha on Friday February 02, 2018 @04:53AM (#16289506)
It does, perhaps, have the advantage of not needed a satellite fleet to work. So therefore isn’t at the whim of said fleet’s owner, or someone with anti-satellite missiles.

(Granted that the antenna size problem might be a killer)

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Re:What If GPS Stood for “Galactic Positioning System”? by gambiting on Friday February 02, 2018 @06:38AM (#16289814)
Star trackers do exactly this, providing relatively accurate positioning without GPS:

https://en.wikipedia.org/wiki/Star_tracker

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Re:What If GPS Stood for “Galactic Positioning System”? by MayeulC on Friday February 02, 2018 @07:46AM (#16290100)
I was about to suggest the use of a sextant for this. As far as I know, navigators are still trained to operate them in this day. Of course, the same operational principle can be integrated into a dedicated device.
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Re:What If GPS Stood for “Galactic Positioning System”? by oceanswave on Friday February 02, 2018 @07:32AM (#16290022)
Was going to say this, and in use by things like submarines and ships since the 60’s
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