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    Re: CELNAV .pdf file
    From: Jared Sherman
    Date: 2003 Dec 25, 21:33 -0500

      Not just knock it, but it destroys the electonics 
    and melts the circuit traces if the overload is sufficient. In the days after 
    WW2 when the US was still playing with aerial bomb tests, they did one that 
    apparently generated enough EMP to set off every burglar alarm (the long 
    trace wiring acts as a nice antenna) in Honolulu. I don't remember the 
    details, only the reference to a 'practical test' of EMP accidentally 
     There are discussions you can find on the web about setting off EMP bombs 
    (designed to create an EMP burst only, or mainly) and you'll find plenty of 
    other references about it. But an EMP blast close enough to fry your GPS 
    receiver is of no consequence...it will be a realtively local event with 
    plenty of other, ah, consequences. For EMP to be a major issue it would have 
    to be EMP bursts near the satellites themselves. Since they are specially 
    hardened, relatively inaccessible (so far) and there are spares in orbit and 
    on the ground...
     Not a real problem. (Like I said, if my GPS goes down because the system has 
    been hit, I think I'll have other larger worries. Like food, water, and safe 

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