There is a much more dangerous scenario in play here.
The Russians may not be jamming GPS (this is a VERY hard thing to do, the signal is coming from above and the receive antenna is generally designed to be hemispheric — meaning excludes signals not from upwards).
The more dangerous scenario is they have figured out how to localize EMP and disrupt circuitry. If they have, the sooner people just surrender the better, because there will be no defeating that.
The Russians may not be jamming GPS (this is a VERY hard thing to do, the signal is coming from above and the receive antenna is generally designed to be hemispheric — meaning excludes signals not from upwards).
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GPS can be jammed. The signal is baseband spread spectrum so power requirements are reduced and multiple signals can be sent using the same frequency. Jamming is simply putting out enough power to mask the low-power GPS signals. Russians have been doing it for over 20 years.
Spoofing (false signals) the GPS is a little tougher but also being done within the last ten years or so if memory serves. That drives the navigation off so the target is missed. I’m not going to chase it.
You might try looking up navigation errors using GPS reported by aircraft pilots in the middle east regions. That’s the spoofing problem.
The Russians are likely spoofing the open civilian GPS so as to overwhelm the signal and misdirect weapons that rely on it. An encoded military GPS signal is used in current US weapons but those have not been sent to Ukraine, which has been mostly getting older model weapons with civilian GPS for guidance.
Owen, GPS does come from above but it is a very weak signal compared to the jamming systems. The jammers totally screw up the frequencies used by the GPS.
All your assumptions about GPS are dead wrong.
WW2 level tech would not be affected by emp. Tube gear is not affected. Pls point/coil cars not affected. Wars would still go on. As always.