I think that when a GPS chip reports that there are no satellites found then 
you got a jammer or a tunnel!

At 07-10-2013, you wrote:
>Hi
>
>Anything that will receive up there should be able to tell you when a jammer 
>comes by. The issue is that not a lot of gear is made for that band (other 
>than GPS receivers). The easy approach would be to use a modern GPS module 
>that puts out noise level / jamming information. 
>
>Bob
>
>
>On Oct 7, 2013, at 12:59 AM, Hal Murray <[email protected]> wrote:
>
>> The recent discussion of solar flares screwing up GPS timing was interesting.
>> 
>> I just watched Todd Humphreys TED talk again.  He's focused on location, but 

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