NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS Time and Navigation
From: Marc Bernstein
Date: 2008 Apr 24, 23:48 -0400
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.
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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?
Regards,
Frank Jones
Rochester, NY
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