GPS time variance - SailNet Community

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Old 08-19-2003
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GPS time variance

A few of us were practicing race starts over the weekend, and came to find that there were as much as 10 seconds'' variance in the time signals we were receiving on our GPS units. Units varied from Magellan 315 hand-held to some more sophistocated ones, but I always assumed that the data would be the same.

Is this "normal"? We were all in close proximity to one another, and I assume we''d be receiving the same signals.
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Old 08-19-2003
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GPS time variance

I''m surprised to hear that. I thought GPS time was exact. Mine has always been synchonized with any others that I''ve compared with.
I''m interested to hear the answer to this one.

AJS
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Old 08-19-2003
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GPS time variance

Just off of the top of my head, the GPS time signal is off something like 13 seconds from actual time. It has to do with the tuning of the signal or something. I think that some of the more expensive and/or newer units may take this into consideration and correct it while the older/less expensive ones don''t.
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Old 08-20-2003
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GPS time variance

Well, I checked on the Net, and the Pirate is right. Here''s a link that explains why GPS time isn''t always "GPS Time" --- http://gpsinformation.net/main/gpstime.htm
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