this post was submitted on 29 Aug 2026

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World's first GPS-free quantum navigation trial succeeds at sea (interestingengineering.com)

submitted 6 days ago by Gsus4@mander.xyz to c/technology@lemmy.world

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[–] Knock_Knock_Lemmy_In@lemmy.world 6 points 5 days ago (2 children)

Why do we expect this quantum map of gravity and magnetic fields to be permanent?

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[–] frongt@lemmy.zip 10 points 5 days ago (1 child)

Why do you think they expect it to be permanent? We survey all kinds of stuff like this all the time.

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[–] Knock_Knock_Lemmy_In@lemmy.world 7 points 5 days ago (2 children)

Geography and celestial maps are permanent (mostly).

The next question is, how long until a quantum measured map becomes unrecognised? Is the half life years or hours?

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[–] silicon@lemmy.dbzer0.com 4 points 5 days ago

I'm guessing remote sensing will be involved with keeping the maps accurate.

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[–] Natanael@infosec.pub 1 point 4 days ago (1 child)

There's literally whole projects to map out movements of continents and the change of the geoid shape of earth, although it takes a few years for it to matter in most cases

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[–] Knock_Knock_Lemmy_In@lemmy.world 1 point 4 days ago (1 child)

Unless there is volcanic activity, geography can be considered permanent within a lifetime. Given the accuracy this technology claims, I suspect the lifespan is very short lived.

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[–] Natanael@infosec.pub 2 points 4 days ago*

https://www.djublonskopf.com/2014/09/02/how-do-we-know-the-continents-are-moving/

Multiple centimeters per year isn't nothing but it is enough to force recalibration within your lifetime, multiple times

You don't use those kinds of sensors non-stop from one calibration. You recalibrate and update maps regularly. Then if you lose some sensors you can still read reckon with high enough precision for weeks

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[–] some_kind_of_guy@lemmy.world 2 points 5 days ago

It is not permanent, but the changes are slow enough

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