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    Re: GPS ground stations
    From: Fred Hebard
    Date: 2014 May 15, 10:03 -0400

    The Wikipedia article is fairly comprehensive, and well documented, 
    WAAS requires its own satellites and ground stations.  The article mentions 
    some efforts in India and Europe to develop WAAS for their regions.  The 
    original covered North America.  I would expect Russia to use its own Glonass 
    system rather than the GPS system as the foundation for a WAAS-type 
    The primary purpose of WAAS is to assist airplane landings.
    So it would not be WAAS itself that the Russians are threatening to close.  
    There are other dGPS systems, some run by private corporations.  John Deere's 
    Starfire system appears to be world-wide.  Perhaps one of their ground 
    stations was in Russia.
    Fred Hebard
    On May 15, 2014, at 9:31 AM, Alexandre Eremenko wrote:
    > Fred,
    > Thanks for your explanation,
    > > As of October 2007 there were 38 WRSs: twenty in the contiguous United 
    States (CONUS), seven in Alaska, one in Hawaii, one in Puerto Rico, five in 
    > > and four in Canada.[6][7]
    > It is interesting whether there are any in Russia.
    > Otherwise what are the Russians threaten to close?
    > Alex.
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=127761

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