The Russian GLONASS is also available.
Thanks, I completely forgot about GLONASS. Anyone preparing for a SHTF scenario might want to consider getting a receiver that works for both GPS and GLONASS. The Russians are less likely than the Europeans to degrade their signal, in the event the U.S. government asks them to.
However, I would be greatly surprised if the U.S.A doesn’t have the capability of degrading, or completely blocking any system it wants, anytime it wants to.