when the GPS system fails
Chicken Little, and still sounding like a broken record.
If the GPS system did ever fail or a proposal is made to turn it off, I dare say amongst others the American public would have something to say about it. All those street navigators, vehicle trackers, time check systems etc. etc all affected?
Do we not get pay TV (or terrestrial TV for that matter) in case a satellite fails or someone turns one off?