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    Re: Consistent error question
    From: Bill B
    Date: 2014 Oct 02, 17:42 -0400

    On 10/2/2014 3:51 PM, Greg Rudzinski wrote:
    > If you don't have a short wave then use GPS time or the attached online
    > link to UTC.
    I would not suggest taking time off a GPS unit for testing/calibration
    purposes. There has been discussion on this subject in the past. I have
    seen my Garmin's display skip over an entire second. (I actually made a
    video recording of that at 30 frames per second to be certain and time
    in seconds is not close to exact.) A Garmin engineer's explanation was
    that the GPS unit is relegating its processing power to read the
    satellites and process position, velocity etc., and the time display
    gets the short end of the stick. (Akin to an idiot cousin seated in a
    corner at family gatherings :-)
    You can pick up a decent atomic (radio controlled) wristwatch for use in
    the US of A for about $30 and change on Amazon. It can display the last
    time it reset itself automatically. Turn off the automatic feature and
    rate it for 10 days. (Mine runs 1 second fast over 8 days now if it does
    not auto reset.) If it fails to auto reset for some reason now and again
    when returned to automatic mode, you know it's rate of change and can
    adjust for watch error.

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