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A comment on Back-ups for GPS: Satellite-navigation systems at risk of jamming. Parent comment

Re:Back-ups for GPS: Satellite-navigation systems at risk of... by throw0101a on Friday May 07, 2021 @11:16PM (#27083487)
> With modern software, shouldn't it be possible to create accurate kit that can determine the location up to few hundred feet based on pictures we take of the Sun or moon, compass and altitude reading?

Unless it's cloudy.

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