The global positioning system on which so much of modern life depends faces two basic threats. One, it’s easy to spoof, placing things at locations other than where they actually are. Second, it’s vulnerable to interruption, say, if another nation wanted to make mischief with GPS satellites. Our guest says it’s time to fund a plan already in place for the Transportation Department. Former deputy assistant secretary of DOT, now teaching economics at George Washington University, Diana Furchtgott-Roth, joined Federal Drive with Tom Temin.