[Targan]

Originally Posted by StainlessSteelCynic

I said this in the other thread and I'll say it again here because obviously the message was not understood -
GPS satellites specifically (and other satellites in general) need constant ground station monitoring and control. Once the war starts and you lose those personnel and/or ground control stations, the satellites are going to lose timing synchronization and/or the maintenance of their orbit.
It will NOT matter how many satellites are still up there, they won't be in the specific orbits needed or they'll be suffering synchronization problems and all of that will render them useless for navigation.

Correct. Real-World Relativity: The GPS Navigation System

Originally Posted by Real-World Relativity: The GPS Navigation System

The combination of these two relativistic effects means that the clocks on-board each satellite should tick faster than identical clocks on the ground by about 38 microseconds per day. This sounds small, but the high-precision required of the GPS system requires nanosecond accuracy, and 38 microseconds is 38,000 nanoseconds. If these effects were not properly taken into account, a navigational fix based on the GPS constellation would be false after only 2 minutes, and errors in global positions would continue to accumulate at a rate of about 10 kilometers each day! The whole system would be utterly worthless for navigation in a very short time.