Communications of the ACM
ACM Opinion
What Would Happen If G.p.s. Failed?
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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