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    Re: GPS Anti Spoof based on radio sextant ?
    From: Igor S.
    Date: 2020 Jan 29, 14:22 -0800

    Frank Reed, you wrote:

    Most likely, it didn't work well, it was an experiment that failed

    and

    I don't see any historical evidence that it was ever used for marine navigation except in experiments

    Why did they place those on nuclear subs? Sake of experiment rather then for regular use ?
    There is no that much room for a useless equipment on board. Even some soviet diesel-electric (!) submarines had it.
    I have a book with schematic description of soviet submarines where many designs had radio sextant mast on board. A good example is Typhoon-class missile sub. from early 80's (!) ( https://en.wikipedia.org/wiki/Typhoon-class_submarine ) - an icon of the cold war. They are still in service today. See a number 44 in the descriptive picture below.  
    Another example is US nuclear powered submarine Thomas A. Edisson ( https://en.wikipedia.org/wiki/USS_Thomas_A._Edison ). If you have a closer look at it (photo on wiki page) you can find a radio sextant dome. The reference to it I found in one old soviet review journal (1964) with a schematic description (see attached photo). In the end of the article it is said that:
    "LOP obtained with radio sextant is much more accurate than one obtained by a professional mariner with an optical sextant" (a quotation from US naval institute proceedings, June, 1963).

    kind regards,

    Igor
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