The Global Positioning System, or GPS, has — somewhat surprisingly — found itself at the heart of modern civilization. I don’t think anyone predicted how significant GPS would be today, just 14 years after it was made freely and globally available to civilians and commercial operations in 2000 — but hey, it happened, and there’s no going back. There is no doubt that the ubiquity of GPS across all areas of civilian, commercial, and scientific endeavor has improved the quality of life for billions of people. From self-driving cars to clock synchronization, from geofencing to earthquake prediction to finding a safe walking or cycle route home, GPS really is one of the most vital services. It is a little bit scary, then, that GPS can very easily be jammed by terrorists or other nefarious actors.