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    Re: Warning from the architect of GPS
    From: Geoffrey Kolbe
    Date: 2014 Feb 14, 12:31 +0000

    On 14/02/2014 02:06, Brad Morris wrote:
    > Widespread jamming requires a series of powerful transmitters (or just
    > one).  No big secret there.
    
    Actually, it is not quite as simple as that. Large and expensive systems
    that depend on GPS for navigation can use highly directional antennae to
    track the satellites using the ephemerides that are constantly
    downloaded to the receiver. This makes GPS reasonably jamming-proof.
    
    As I reported earlier, trials were done on one of the larger UK warships
    and the most determined effort to jam the GPS moved the ship a virtual 8
    feet...
    
    Geoffrey Kolbe
    
    --
    Dr Geoffrey Kolbe, Riccarton Farm, Newcastleton, TD9 0SN
    Tel: 013873 76715 Mob: 07811 154621
    
    

       
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