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World's first GPS-free quantum navigation trial succeeds at sea
(interestingengineering.com)
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this post was submitted on 29 Aug 2026
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I don't think it's realistically possible to do that totally undetected. Since the earth's magnetic field is so weak and field strength goes down rapidly as distance increases, malicious actors probably couldn't spoof patterns well enough to make the data look real, at least not without coming very close and staying near their target.