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World's first GPS-free quantum navigation trial succeeds at sea (interestingengineering.com)
submitted 2 months ago by to c/technology@lemmy.world
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[–] 24 points 2 months ago (8 children)

So you constantly need updated maps. Reminds me of celestial navigation where you always need an up-to-date almanac.

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  • [–] 9 points 2 months ago (6 children)

    But how do you get your position to update your map? Oh... GPS will work!

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  • [–] 6 points 2 months ago (5 children)

    What? You just download a new map for the area you want to go to every year or so, no need for GPS

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  • [–] 4 points 2 months ago (4 children)

    I'm not sure you got me. How do the map makers update the map? If the gravity variance changes so it can't be used to determine your position then clearly you need some other way to determine your position to update the gravity map. And what might that be??

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  • [–] 5 points 2 months ago (3 children)

    Using the same reference points on earth that GPS uses, that doesn't mean using GPS.

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  • [–] 4 points 2 months ago (2 children)

    That doesn't work too well out in the ocean and lots of other places too. If you can't use your gravity map, you're gonna use GPS for precise position data.

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