Comment Re:GPS+Galileo+GLONASS+BEIDU+IRNSSUKGNSS (Score 2) 108
Use all of them at the same time and do a "majority rule" positioning.
Unless there is global war in multiple theatres, at least some of them will not be jammed
You aren't talking about multiple theaters, theater just means one location. Jamming is occurring in one location. You can just spoof or jam signals for all the various GPS systems in one location.
It doesn't matter if the ground stations for GPS are located in 1 location, Glonas in a different one & Galileo in a 3rd. They all have satellites overhead globally & the signals are in very nearby bands. You just have to blast out a jamming or spoofing signal in the target area & you affect all of them in that region.