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    GPS Time
    From: Dan Allen
    Date: 1999 Mar 15, 14:38 EST

    With my old Garmin GPS 40 I noticed that occasionally the displayed time on
    my GPS was up to 1.5 seconds off of WWV.  More recent Garmin receivers seem
    to be better.
    One other potential "gotcha" with GPS receivers: until the satellites are
    locked on, the displayed time may be WAY off.  The built-in clock is
    terrible.  I guess Garmin assumes you will always have the satellites
    around, but before lock on I have seen the displayed time off as much as a
    MINUTE or more (especially if the GPS has been sitting unused for a few
    months).  Once the 3rd satellite appears, then the time jumps to the "real"
    time.
    We need more accurate clocks available.  A few watch manufacturers in the
    1980s made "Twin-Quartz" watches (Seiko Lasalle and Omega) which were
    thermally compensated and would not be off a single second in a year.  If
    they were off from WWV, it was usually because a leap-second had been
    inserted!  Alas, I do not own either watch (a friend has had these), but I
    wish somebody would make a twin-quartz chronometer again with ultra accurate
    time.
    Dan
    -----Original Message-----
    From: Richard Langley [mailto:lang{at}XXX.XXX]
    Sent: Monday, March 15, 1999 5:34 AM
    To: Rick Emerson
    Cc: navigation{at}XXX.XXX
    Subject: Re: FW: [Nml] 249 v 229 , Starpath, time tick
    P.S.  The time indicated by a GPS receiver on its screen may be a fraction
    of
    a second delayed due to receiver microcomputer task scheduling.
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