> it wouldn't just disrupt planes, it would crash planes if this were not even planned as a contingency. It would not. Aircraft have other navigation systems t

> it wouldn't just disrupt planes, it would crash planes if this were not even planned as a contingency. It would not. Aircraft have other navigation systems they can use instead, such as inertial reference and ground-based VOR navigation. And where there's radar coverage, they can be vectored by controllers. This probably couldn't be used to keep up with the volume of air traffic today, but it would be enough to get existing flights down safely. For landing, ILS is still very common, and doesn't require GPS either. An aircraft planning to land at an airport without ILS will have no trouble finding a nearby diversion airport that does have it. Even as more ground-based navigation beacons are decommissioned, retaining enough for such an emergency remains an active consideration.