A GMT function in a watch allows the wearer to track multiple time zones simultaneously, typically using a 24-hour hand and a rotating bezel or an additional time scale.
How It Works
- Standard Hour and Minute Hands – These function like a normal watch, displaying local time in a 12-hour format.
- GMT Hand – This additional hand circles the dial once every 24 hours and is typically in a different color for easy readability.
- 24-Hour Scale – The GMT hand points to this scale, either on the dial or a rotating bezel, to indicate the second time zone.
- Rotating Bezel (Optional) – Some GMT watches have a bidirectional rotating bezel with a 24-hour scale, allowing you to track a third time zone by adjusting it.
How to Use a GMT Watch
- Two Time Zones: Set the regular hour and minute hands to local time and adjust the GMT hand to your home or reference time.
- Three Time Zones: If your watch has a rotating bezel, align it with the GMT hand to track an additional time zone.
Popular Uses
- Frequent Travelers – Helps keep track of home and destination times.
- Pilots – Originally designed for aviation, as seen in Rolex’s GMT-Master.
- Business Professionals – Useful for coordinating meetings across different time zones.