“It’s tough to overstate how GPS-dependent the world economy has become since the U.S. Department of Defense started giving the service away to the public in 2000. There are 2 billion GPS receivers in use around the world, a number that Europe’s satellite navigation agency estimates will hit 7 billion by 2022. Along with the telecommunications industry, banks, airlines, electric utilities, cloud computing businesses, and TV broadcasters require constantly precise GPS timing. Emergency services do, too, as do military forces. The U.S. Department of Homeland Security has designated 16 sectors of infrastructure as ‘critical,’ and 14 of them depend on GPS.” BloombergBusinessweek: The World Economy Runs on GPS. It Needs a Backup Plan.