Ahhh...., yes. "UTC". That's what I meant by "Earth Time".
Need...more...coffee...
73, Jim
On 02/02/2012 08:44 PM, jmfranke wrote:
The difference between GPS time and UTC is adjusted as necessary. The
adjustments come in the form of leap seconds and are added when needed
at the end of June or December. The difference between GPS time and
UTC is currently 15 seconds. There will be a leap second added this
coming June 30. What is being seen is the casual user GPS receiver
software does not put a high priority on time display.
John WA4WDL
--------------------------------------------------
From: "Jim Jerzycke" <kq...@verizon.net>
Sent: Thursday, February 02, 2012 3:18 PM
To: <amsat-bb@amsat.org>
Subject: [amsat-bb] Re: GPS Time observation
I think this has something to do with "GPS Time" vs "Earth Time".
IIRC, GPS time doesn't take into account the Leap Seconds that have
been added to Earth time since the first GPS satellites have been
launched. I think some of the newer receivers can compensate for
this, but I'm not sure.
It's been about 14 years since I last worked in the GPS industry, and
I'm a bit rusty on all the new stuff!
73, Jim KQ6EA
On 02/02/2012 04:57 PM, George and Cheryl Abbott wrote:
I'm not sure about GPS,but I have noticed that the clock on our
cable box is off by up to 4 seconds at times.Customer service was
not aware or concerned when I let them know.
-----Original Message----- From: Vince Fiscus, KB7ADL
Sent: Thursday, February 02, 2012 10:28 AM
To: amsat-bb@amsat.org
Subject: [amsat-bb] GPS Time observation
I have an old GPS unit, a Magellan explorist 210. It's fairly accurate
determining position. After it has acquired about eight to ten
satellites
the position error averages between 20 to 35 feet. Now the
question, the
other day I was looking at one of the information pages the unit can
display and on it, it gives the time in UTC. Just for fun I thought
I would
see how close the time was to WWV. I was surprised to see the unit was
between one to four seconds off over various tests compared to WWV. IS
this typical of all GPS units or do some display the time of day more
accurately?
KB7ADL
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