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People might be surprised by this but GPS jammers are widely available, here's an article about a truck driver in New Jersey who got caught with one 3 years ago:

http://www.nj.com/news/index.ssf/2013/08/man_fined_32000_for...

So it's not like the Kremlin has started using some highly sophisticated countermeasures, I bet you can order GPS jammers from Alibaba.

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If, as suggested by the article, it's acrively telling you you're somewhere else, that's an order of magnitude more sophisticated than the alibaba jammers which truckers use to just stop their trackers.

This might be accomplished by something no more sophisticated than a repeater, they're cheap and readily available to provide GPS location inside buildings. Simply stick an antenna on the roof and the indoor transmitters will cause indoor devices to resolve the location of the roof antenna.

I wonder if the same principle could be used to pipe an authentic signal a few miles then amplify it sufficiently to be preferred by nearby devices

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