The Future of Satellite Navigation

GPS isn't the only global navigational satellite system. There's a Russian one too called GLONASS although it isn't as good. China and the European Union have well advanced projects called Baidu and Galileo, Japan and India are working on systems too. These alternative satellites might help us ride out problems specific to GPS but they might also make tempting military targets in any future conflict. A big enough solar storm could also do the job.