And something more important about satellites, they need constant monitoring to ensure they stay in the proper orbit.
For GPS satellites, it's critical and they also need their atomic clocks monitored to ensure that they stay aligned with Earth time (because both General and Special Relativity mess with them).
Once a few of them start to drift, so does your GPS navigation. Typically, a GPS receiver will get info from four satellites but it can happily make do with three - once the third satellite starts to drift, you are shit outta luck.
With the loss of personnel to control/maintain them, any high altitude EMP interfering with them, damaged satellites and other debris hitting them and no space programme to correct any problems, GPS would lose needed accuracy within a few weeks to a month and probably be totally dead within one to two years.
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