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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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[–] 7 points 2 months ago (1 child)

Radar is radio, just like most satellites. It doesn't do well through water. And that would require emissions, which submarines like to avoid.

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  • [–] 6 points 2 months ago

    I'm guessing they meant sonar instead. AFAIK active sonar does work really well, but is rarely used since it reveals your location twice as far as you're able to detect others. Not to mention the horrible effects on wildlife - the sound waves carry so much energy that a point-blank hit is somewhere between "lethal & untreatable" and "turned into red mist".

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