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    FW: 249 v 229 , Starpath, time tick
    From: Rick Emerson
    Date: 1999 Mar 14, 9:06 PM

    craig{at}scsn.net writes:
     > Actually, the GPS (satellite) time is off by about 12 seconds.  Each
     > manufacturer corrects for this inside the unit.  Accuracy may be affected by
     > internal errors, but I'm sure it's accurate enough for celestial navigation.
     >
    
    Er, the correct answer is "it depends".  Some receivers make the
    adjustment between ...what?... UTC1 and UTC2.  While I probably have
    the names swapped, one's "atomic time" and one's "star" or civil time.
    The former is so accurate that it can detect small variations in the
    Earth's rotation which is the basis for the latter.  The cumulative
    error is the difference between the time as determined by various
    atomic clocks and the time as determined by timing transits.
    Adjustments are added or subtracted on the last day of June or
    December.  A second was added at 23:59:60 on 31 Dec. 1998, for
    example.
    
    Anyway, the point is that the difference is known and some receivers
    display atomic time and some display civil time.  The only sure way to
    know what a given receiver does is to compare its time with WWV or
    WWVH.
    
    Rick
    S/V One With The Wind, Baba 35
    
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