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    Re: An actual case of GPS Jamming
    From: Frank Reed
    Date: 2013 Aug 12, 11:17 -0700

    Brad, you wrote:
    "So for $100, you can locally jam the receiver. Make the noise big enough and the signal doesn't make it through. Its a trivial exercise in broadcasting on a reserved frequency, say, right around 1575 MHz."

    Oh yes. That much is well-established. The robustness of the GPS system depends, not on any intrinsic security of its signals, but rather on the huge number of users who are dependent on it and therefore aware of any disruptions. Jamming is easy. Jamming without getting noticed --and without getting caught-- is somewhat more difficult.

    And you added:
    "A similar statement can be made vis the broadcast of time. You don't have to swamp it out all over the world, just locally. "

    I believe you're referring here to your proposed solution to my "celestial spoofing" thought experiment. In case you misunderstood my reply, I do absolutely agree with you that you could do this LOCALLY. Would that be a viable solution? Do navigators slavishly listen to radio time signals? Could you find some way to keep a time signal spoofing transmitter in range of each vessel in this imaginary sailing race?

    -FER

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