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GMT watches track two time zones simultaneously using a dedicated 24-hour hand and a rotating bezel. Setting one correctly for the first time can be confusing — here’s the definitive step-by-step guide for the most common GMT mechanisms.
Setting a Rolex GMT-Master II
The GMT-Master II uses an independently-adjustable hour hand, allowing you to set local time without disturbing the GMT (home time) hand.
- Unscrew the crown and pull to Position 2 (middle position)
- Turn the crown to advance the GMT hand to your home time zone, aligning it with the 24-hour scale on the bezel
- Set the bezel’s 24-hour scale to local time: rotate it so the current local hour aligns with the GMT hand
- Pull crown to Position 3 (full out) and set the local time using the main hour and minute hands
- Push crown back and screw down
Setting an Omega Co-Axial GMT
Most Omega GMT watches use a 24-hour subdial or a third timezone complication. Consult your specific model’s manual, as mechanisms vary between Aqua Terra and Seamaster GMTs.
Understanding GMT Hand Types
- Independent GMT (Rolex GMT-Master II): Hour hand adjusts independently of GMT hand — best for travelers
- Integrated GMT (most other brands): Both hour hands move together — requires full time reset when changing local time zones
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