Accuracy of atomic watch

Thread: Accuracy of atomic watch

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  1. #1
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    Accuracy of atomic watch

    This is purely out of curiosity. I noticed that my watch is off by 5 seconds compared to the clock on time.gov .I really am not that much of a stickler for this, but I find it interesting. Also, why do they call something water resistant. Surely if its resistant to 200m , its waterproof at 50m?

  2. #2
    Moderator G-Shock Forum
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    Re: Accuracy of atomic watch

    What kind of atomic watch are you using?

    If its a analog hands watch without "tough movement" the hands may not be zeroed.

    Digital atomic watches should stay spot on the atomic time (if signal is received once a day)

    I dont understand your 50<>200m question.

  3. #3
    Member Maine's Avatar
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    Re: Accuracy of atomic watch

    There's a really good thread on this here. Do scroll down to the links as well
    The Search function on vBulletin forums isn't very smart. If you want to search for a complete string in the G-Shock forum, or for posts which include multiple words, use Google, and enter site:forums.watchuseek.com/f17 into the search box. Then use normal google syntax after that to enter your search.

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  5. #4
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    Re: Accuracy of atomic watch

    Just checked my GWM-5600 and its bang on with time.gov. It last synced about 12 hours ago.

  6. #5
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    Re: Accuracy of atomic watch

    To answer the question, the accuracy [let's say the the deviation of time keeping from a hypothetically perfect reference] of Casio's atomic watches is the same as their non atomic watches: +/- 15 seconds a month within some temperature boundaries. The atomic timekeeping is best thought of as an invisible hand that attempts to synchronize your watch once a day to a reference standard.
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  7. #6
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    Re: Accuracy of atomic watch

    Quote Originally Posted by a-Tom-ic View Post
    To answer the question, the accuracy [let's say the the deviation of time keeping from a hypothetically perfect reference] of Casio's atomic watches is the same as their non atomic watches: +/- 15 seconds a month within some temperature boundaries. The atomic timekeeping is best thought of as an invisible hand that attempts to synchronize your watch once a day to a reference standard.
    This.

    So essentially to say they are more accurate may not be 100% true. They may not be more accurate than a normal G-shock that you manually synced with time.gov every day. The difference is that they just sync themselves up every night by themselves.

  8. #7
    Member TimeToLive's Avatar
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    Re: Accuracy of atomic watch

    That's correct.

  9. #8
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    Re: Accuracy of atomic watch

    Just checked my GW5000. It is spot on accurate to the Time.gov. Last, atomic synced a month ago I know it's hard to believe my GW5000 is dead accurate even without any syncing! My Seiko SBCM023 is also right on the money for about 1 month now.

  10. #9
    Member edhchoe's Avatar
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    Re: Accuracy of atomic watch

    mine is 1-2 sec off from the computer time at work.

  11. #10
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    Re: Accuracy of atomic watch

    Quote Originally Posted by edhchoe View Post
    mine is 1-2 sec off from the computer time at work.
    Computer clocks are terrible as they always seem to be off anf deviate quickly in my experiences.

    My mtg900 syncs a couple times a day and everytime I havechecked it against the national clock it has been bang on.

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