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.
Typical estimates are that they'll be useful for a few weeks, maybe a month after the loss of ground control stations and within a year or so the entire system will be completely unreliable.
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