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    Re: GPS as a time authority
    From: UNK
    Date: 2009 Sep 15, 16:17 -0400

    On Tuesday, September 15, 2009 2:55 PM, Richard B. Langley 
    said:
    > No it isn't. The receiver must keep track of rollovers by itself. More
    info here:
    > .
    > -- Richard Langley
    >
    > Quoting Smith_Peter@emc.com:
    >
    >> The number of roll-overs is included in the  GPS message stream
    
    Actually, since your (very interesting, by the way) article was written
    in 1998, the GPS message stream has been beefed up to include, among
    other data, a 13-bit Extended Week Number or Transmission Week Number
    (not exactly a count of roll-overs -- I misspoke). This field is in
    message type 10, bits 39-51. See NAVSTAR GLOBAL POSITIONING SYSTEM
    INTERFACE SPECIFICATION, IS-GPS-200, 7 March 2006 at
    https://navcen.uscg.gov/gps/modernization/IS-GPS-200D_w_IRN_1_7Mar06%20N
    S.pdf
    
     -- Peter Smith
    
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