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What Would Happen If G.p.s. Failed?

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G.P.S. spoofing

With the right tools, a G.P.S. hacker could disrupt financial markets or make an aircraft fall from the sky.

Credit: Aleks Sennwald

The radio signal that is the lifeblood of the Global Positioning System originates from a constellation of twenty-four satellites, orbiting more than twelve thousand miles above Earth.

From The New Yorker
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