I call BS. At worst, this would be an attempted rewrite of history; at best it shows sheer ignorance. GPS, insofar as humans use it, consists of only a passive receiver that reports a 2D or 3D position. Only an very small percentage of receivers integrate any transmission that could be traced externally as, "Here I am!", as do commercial truck company GPS devices.
HF
Do you have a Blackberry??? Or know someone who does...
Take a look at the screen and watch the “signal” bar that shows how well the device is “seeing” the “network”...
Kinda fluctuates doesn’t it??? and there is a handoff, or back and forth, incoming and outgoing data stream constantly working for you on those devices...
I’m just saying that you might be able to shut off one direction of the data flow (signal jammer), but getting the other direction of flow, will obviously require a dramatic fix, that can reveal you if you put the device back into service anyway...
It’s still kinda fun to try to spoof these things to se what you can actually do in a pinch...