How much more complicated is a GMT movement?
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  1. #1
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    How much more complicated is a GMT movement?

    The GMT hand moves at half the rate of the hour hand so that's just gearing I assume.
    Is there a lot more to it?

    Excuse the simplistic, uninformed view I have of watch movements if I'm way off base.

  2. #2
    Member cedargrove's Avatar
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    Re: How much more complicated is a GMT movement?

    I think it's more than just gearing between the hour and 24 hour hands. On my GMT the hour hand can also be independently adjusted I hour increments without stopping/hacking the time, and also triggers date changes forwards and backwards.

  3. #3
    Member Likestheshiny's Avatar
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    Re: How much more complicated is a GMT movement?

    A 24-hour hand would be as simple as you describe. A GMT movement also needs an addition crown setting and the guts to do what cedargrove mentions above. Otherwise, you're just getting a third hand that's permanently locked in with the main hands.

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    Member mleok's Avatar
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    Re: How much more complicated is a GMT movement?

    It's about as complicated as a day-date complication. Indeed, the ETA 2836-2 day-date movement can be quite easily modified to have the same GMT functionality as an ETA 2893-2.
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    Re: How much more complicated is a GMT movement?

    Quote Originally Posted by cedargrove View Post
    I think it's more than just gearing between the hour and 24 hour hands. On my GMT the hour hand can also be independently adjusted I hour increments without stopping/hacking the time, and also triggers date changes forwards and backwards.
    My non-GMT Omega PO can set the hour hand independently so that seems like a feature not specific to GMTs.

  7. #6
    Member BrentYYC's Avatar
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    Re: How much more complicated is a GMT movement?

    Quote Originally Posted by scosmoss View Post
    My non-GMT Omega PO can set the hour hand independently so that seems like a feature not specific to GMTs.
    You're absolutely right. Some GMTs have the feature of a quick set hour hand, but most don't. I doesn't define a GMT.

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    Member Camguy's Avatar
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    Re: How much more complicated is a GMT movement?

    Quote Originally Posted by BrentYYC View Post
    You're absolutely right. Some GMTs have the feature of a quick set hour hand, but most don't. I doesn't define a GMT.
    Actually, it does. If either the hour hand (the more useful way, IMHO) or the GMT hand can't be set independently, then it's just a 24-hour display.

  9. #8
    Member dbostedo's Avatar
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    Re: How much more complicated is a GMT movement?

    Quote Originally Posted by Camguy View Post
    Actually, it does. If either the hour hand (the more useful way, IMHO) or the GMT hand can't be set independently, then it's just a 24-hour display.
    BrettYYC is not suggesting that the hour hand and GMT hand can't be set to different times, just that it's not necessarily a quick set on all GMTs.

    And scosmoss was pointing out that his non-GMT watch also has an hour hand that can be moved independently, despite the fact that it doesn't have a GMT hand.

    Neither is referring to a simple 24 hour display.
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    Re: How much more complicated is a GMT movement?

    After reading all the answers, I think we could summarize like this:

    "It depends..."

  11. #10
    Member Toothbras's Avatar
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    Re: How much more complicated is a GMT movement?

    It's precisely one complication more complicated

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