Omega GMT Chronograph Watch Operating Instructions, based on standard procedures found across Omega’s GMT chronograph models, including Speedmaster and Seamaster variations.

Basic Components

Most Omega GMT chronographs feature:

• Crown (center-right): Used for winding and time setting

• Pushers (above and below the crown): Operate the chronograph

• 24-hour GMT hand: Displays a second time zone

• Date window: Often between 4 and 5 o’clock

Manual Winding (if automatic)

If your GMT chronograph is an automatic model:

• Wind the crown clockwise (when in position 0) about 30–40 times for full power reserve.

• Winding is only necessary if the watch has not been worn for more than 48 hours.

Setting the Time and GMT Hand

1. Pull the crown to position 2 (fully extended):

   • Turn it to set the main hour and minute hands.

   • The GMT hand moves in sync with the main time.

2. Pull the crown to position 1 (intermediate):

   • Turn clockwise to adjust the date.

   • Turn counterclockwise (if applicable) to adjust the GMT hand independently from the main time.

Some models do not allow independent GMT hand adjustment, so the 24-hour hand remains tied to the main time.

Reading the GMT Time

• The GMT hand completes one rotation every 24 hours.

• Use the 24-hour bezel or fixed scale on the dial to read the second time zone.

  • Example: If the main time is 10:00, and the GMT hand points at 16 on the bezel, your second time zone is 4:00 PM.

Using the Chronograph

1. Start: Press the upper pusher.

2. Stop: Press the upper pusher again.

3. Reset: Press the lower pusher (only after stopping the chronograph).

Chronograph hands measure:

• Seconds (central hand)

• Minutes (usually a sub-dial at 3 o’clock)

• Hours (sub-dial at 6 o’clock)

Practical Notes

• Avoid adjusting the date between 8 PM and 4 AM, as this may damage the date-change mechanism.

• The GMT function is especially useful for travelers tracking home time while abroad.

• Chronograph timing should not be run continuously over days—it can reduce power reserve.