GPS, the military satellite system that underlies $74 billion in business from banking to agriculture to taxi services is so easy to take for granted that it is viewed as a public utility. “We consider to have GPS on our phones [and] our watches like turning on a light switch or a faucet and getting electricity or water,” says NASA’s Tim Dunn, a launch director at Kennedy Space Center. “It’s always there—it should be there.” In order for that type ...


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