Iran and GPS etc
Example......decades ago........seeing a track that went from Harris Hill to Europe and back.....in a few seconds. This while the glider and tracker were sitting on the grid at HHSC.......
I believe it was called, "military dithering" of the signal, because, government.
I believe it was interference from the unshielded ignition in Charlie Sprat's van as he drove by to the gate... but hey, that's my theory.
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