Should all the GPS uplink stations be down, the system will degrade rather quickly to the point of uselessness. Some talking heads say that positional accuracy will reduce to half a kilometer within two weeks and by ten kilometers after six months.
There are only four ground uplink stations that can make the adjustments, and they are at Cape Canaveral, Ascension Island, Diego Garcia and Kwajalein Atoll. The master control station is Schriever AFB outside of Colorado Springs.
In my humble opinion, I would guess that GPS is a thing of the past in any version of the T2K universe. OPFOR would have them very high on the strike package list in almost any conceivable war scenario.
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