But as GPS has become commonplace, the risks associated with losing it have grown. In a June 2019 paper prepared for the Department of Commerce, the research nonprofit RTI International estimated the cost of a 30-day GPS outage in the U.S. at $1 billion per day. The marine industry would be among those hit hardest, because of the bottlenecks an outage would cause in ports and waterways. And U.S. losses would represent only a fraction of the worldwide impact.