Question: GPS time synch 10 seconds fast GPW-1000
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  1. #1
    Member will70's Avatar
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    Question: GPS time synch 10 seconds fast GPW-1000

    Hello everyone. I just traded a watch for a G-Shock GOW-1000. Cool watch.

    I did a gps time synch tonight and the watch is exactly 10 seconds ahead of the time shown on time.is and also my network time.

    I then did a re-sync outside on my balcony about a half hour later with the same results. GPS time on the G-Shock is exactly 10 seconds ahead.

    The second hand seems to be aligned fine as when I press the synch button the second hand moves to the TP location as it should.

    Any suggestions.

    I know that GPS time may be very slightly different than network time in the range of milliseconds I believe but I do not think that it would be different by ten seconds.

    Any suggestions or comments?



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  2. #2
    Member yankeexpress's Avatar
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    GPS time is not necessarily real time, as you just learned.
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  3. #3
    Member will70's Avatar
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    Quote Originally Posted by yankeexpress View Post
    GPS time is not necessarily real time, as you just learned.
    Is it normal for it to be a 10 second deviance from network time.




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  5. #4
    lvt
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    Quote Originally Posted by will70 View Post
    Is it normal for it to be a 10 second deviance from network time.




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    Yes it's normal as you are talking about two distinct sources of time.
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  6. #5
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    Quote Originally Posted by lvt View Post
    Yes it's normal as you are talking about two distinct sources of time.
    Or I suppose two different measurement applications of time rather than sources




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  7. #6
    Member GaryK30's Avatar
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    The 10 second difference seems odd to me. The time on my radio-controlled watches matches the GPS time in my car and time.is on my PC to a fraction of a second.
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  8. #7
    Member yankeexpress's Avatar
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    Quote Originally Posted by GaryK30 View Post
    The 10 second difference seems odd to me. The time on my radio-controlled watches matches the GPS time in my car and time.is on my PC to a fraction of a second.
    Differences of GPS time to other time references vary for technical reasons. The US Air Force runs GPS system for its own purposes and the rest of us users have to deal with it.

    At sea on ships, I have noticed time differences for years of a few seconds here and there from atomic sync'd Casio watches.
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  9. #8
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    I know on my Citizen SatelliteWave GPS watch, there is a leap second correction feature. It takes a much longer time to perform the leap second correction, but it then retains the correct offset until the next time a leap second is added (rarely). Perhaps your Casio has a similar feature?

    This is mentioned on page E-35 of the user manual for your watch,

    https://support.casio.com/storage/en...009/qw5410.pdf

    but I do not see a way to force it to perform that sync.


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  10. #9
    Member GaryK30's Avatar
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    Quote Originally Posted by mleok View Post
    I know on my Citizen SatelliteWave GPS watch, there is a leap second correction feature. It takes a much longer time to perform the leap second correction, but it then retains the correct offset until the next time a leap second is added (rarely). Perhaps your Casio has a similar feature?

    This is mentioned on page E-35 of the user manual for your watch,

    https://support.casio.com/storage/en...009/qw5410.pdf

    but I do not see a way to force it to perform that sync.
    On some other Casios, performing a time plus position sync updates the leap second setting.

  11. #10
    lvt
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    Re: Question: GPS time synch 10 seconds fast GPW-1000

    Quote Originally Posted by will70 View Post
    Or I suppose two different measurement applications of time rather than sources




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    I think it's just another way to say the same thing.

    Actually there are no less than four operational satellite navigation systems, GPS is just one of them. You might think you are currently connected to GPS but your device could be on Galileo or Glonass as well, or even Beidou (unless your device is looked to only one of them, either by hardware or software, but I think it's not the case with civilian usage).
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