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    GPS Timing
    From: Vic Fraenckel
    Date: 2002 Jul 29, 07:05 -0400

    I posed the question on a newsgroup alt.satellite.gps about obtaining timing
    for celestial navigation (current thread mentioned below) from a gps
    receiver:
    
    | >I am the originator of the current thread. I was thinking about how one
    | >might use a GPS receiver as the time source for celestial navigation
    fixes
    | >at sea. I really do understand that the "current" time is available from
    | >several NMEA sentences and that these sentences incur some latency. I
    | >suspect WWV and a good quartz clock is better.
    | >
    
    and I receive the following as one response:
    
    | Surely for celestial navigation, errors of sighting are MUCH worse than
    the
    | possible 1 or 2 second errors of GPS time as transmitted in the NMEA
    | sentence.  Since time seconds and arc seconds roughly correspond in this
    | application, I would ask whether you seriously think you can measure the
    | position of a celestial body to within 1 arc second under normal
    navigation
    | conditions.
    |
    
    Does this response make any sense?
    
    Any enlightenment will be appreciated.
    
    Vic
    
    ________________________________________________________
    
    Victor Fraenckel - The Windman                 vfraenc1{at}nycap.rr.com
    KC2GUI                                                      www.windsway.com
    
          Home of the WindReader Electronic Theodolite
                                   Read the WIND
    
    "Victory at all costs, victory in spite of all terror, victory however long
    and hard the road may be; for without victory there is no survival."
    - Winston [Leonard Spencer] Churchill (1874 - 1965)
    
    Dost thou not know, my son, with how little wisdom the world is governed?
    -Count Oxenstierna (ca 1620)
    
    
    

       
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