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    Re: GPS Time and Navigation
    From: Marc Bernstein
    Date: 2008 Apr 24, 23:48 -0400
    I personally had a similar experience a couple of weeks ago with a pair of relatively new Magellan explorists. They were side by side reading the same UTM position within 1 metre of each other. One had the right time, the other one was displaying an updating time about 2 and a half minutes slow. They are both reading the correct time now.

    On Thu, Apr 24, 2008 at 9:24 AM, FJones <wfjones1@ix.netcom.com> wrote:

    I found the following observation interesting.  This past Saturday, while on an 11 mile
    hike I spoke with a fellow that was comparing his GPS to his father's GPS.  Both
    were Garmin models I think.  He found the relatively new devices did not report the
    same position or time.  I asked about the time difference and he indicated his last
    observation yielded almost a two minute difference.  I doubt this was due to mutual
    interference between the devices.  I can not provide any more detail than given.

    I recall early GPS devices commonly displayed times that differed by as much as
    three or four minutes.  The usual explanation was displayed position was given the
    programming priority and time was updated when convenient.  I assumed this
    changed and today's GPS devices would be much better.  Anyone aware of
    documented comparsions of common GPS units available today?


    Frank Jones
    Rochester, NY

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