What would happen if your GPS went down? I don’t mean just the GPS on the chartplotter on your boat, or on your smartphone, or on your tablet, or even on your fitness watch. I mean the entire system. What would happen? Total chaos. Much of our infrastructure and our national defense is based on GPS. Forget about autonomous trucks on the interstate, or getting your next delivery from Amazon. GPS has become an unseen, but invaluable, part of our daily life. The problem is, at least according to this thought-provoking story in The New York Times, it’s too vulnerable.…