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    Re: Threats to GPS and introduction of eLORAN
    From: Geoffrey Kolbe
    Date: 2016 Jan 28, 22:45 +0000

    On Thursday, 28 January 2016, David Barrie wrote:

    Maybe I've missed something in the thread about the reinstatement of celestial navigation at the USNA, but the biggest threat to GPS probably comes from jamming - and it's very real.


    On September 15th 2011, I wrote this to this list:-

    "Yesterday, I went on a conducted tour of HMS Dauntless, a type 45 destroyer in the British Royal Navy.....

    I asked a mid about the principle means of navigation on the ship. He said it was GPS. I expressed surprise, since there is generally great concern about how easy it is to jam GPS signals. "Ah yes," he said, "but we use the military version of the GPS." Same satellites it seems, but a 'ruggedised' signal that is proof from jamming. He said they had some people come on board with a variety of jammers to see how vulnerable the signal was. Their most determined attack moved the Dauntless some 6 metres in virtual space - which was not considered significant.

    On the matter of celestial navigation, he said that there is still a requirement to be proficient in the use of celestial navigation. Indeed, the mid I was talking to was about to go on a refresher course. The traditional noon sight is supposed to still be enacted every day, he said, but not usually in British coastal waters. "

    Geoffrey Kolbe

    Dr Geoffrey Kolbe, Riccarton Farm, Newcastleton, Scotland, TD9 0SN
    Tel: 013873 76715
    Mob: 0773 8069 663

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