Posted by Phoibos on 20th Oct 2023


Welcome to the Phoibos watch blog, where we dive into the fascinating world of timekeeping. In this post, we will delve into the functionality of a GMT (Greenwich Mean Time) dive watch. Whether you're an avid diver or a globetrotter, a GMT dive watch adds a new dimension to your timekeeping experience. Join us as we explore the features, functionalities, and tips for effectively using a GMT dive watch. 

The GMT function on your dive watch is designed to track time simultaneously in different time zones. It allows you to keep track of your local time as well as the time in a reference location. This feature is particularly valuable for frequent travelers or individuals who need to coordinate activities across various time zones.

Reading the GMT Watch:

Reading a GMT watch may seem overwhelming at first, but with a little understanding, it becomes a convenient tool for monitoring multiple time zones.

  • a. Local Time: The main hour hand indicates the local time, just as you would read on a regular watch. Ensure that you have correctly set thewatch to your local time zone.
  • b. GMT Hand: A GMT watch features a fourth hand, known as the GMT hand that displays a second time zone. This hand typically completes one rotation every 24 hours and is often color-coded for better distinction. It represents the time in the reference location or the second time zone. The markings on the bezel allow you to track the time accurately.
  • c. 24-Hour Scale: A 24-hour scale is often located on the outer edge of the watch dial. It helps you distinguish between AM and PM and provides a clear visual representation of the time in the reference location.

Setting Steps for the GMT Dive Watch (Cal.NH34A):

Setting the GMT time on your dive watch with a GMT hand is an essential skill. By following these step-by-step instructions, you can confidently navigate the process and unlock the full potential of your GMT watch. Remember to practice with patience and precision while setting the GMT time, and always refer to the manual for specific instructions.

  • a. Set the Local Time: Start by setting the local time on your watch. Pull out the crown to the second position and rotate it to adjust the hour and minute hands.
  • b. Determine the Desired GMT Offset: Next, determine the GMT offset you'd like to track. This offset represents the time difference between your current location and the GMT reference time. You can find the GMT offset information online or through a reliable time zone converter.
  • c. Set the GMT Hand: To set the GMT hand, pull the crown out to its first position. Rotate the crown clockwise to position the GMT hand to reflect the GMT offset you wish to track.
  • d. Check for Accuracy: To ensure accuracy, compare your GMT watch against a reliable time source, such as an atomic clock or an online timekeeping service. Adjust the GMT hand as needed until it's perfectly aligned with the desired time zone.

Precautions for GMT Watch Usage:

To maintain the longevity and precision of your GMT dive watch, consider the following precautions:

  • a. Bezel Usage: Utilize the rotating bezel to track elapsed time or as a reminder for decompression stops during diving. Regularly clean the bezel to maintain smooth functionality.
  • b. Proper Time Setting: Use official time references or reliable sources to set the correct time on both your local and reference time zones. Ensure accuracy to avoid misalignment between time zones.
  • c. Service Intervals: Adhere to the recommended service intervals for your GMT dive watch to keep it in optimal condition. Regular maintenance and periodic servicing will enhance its longevity and accuracy.

Congratulations! You now possess a comprehensive understanding of how to use a GMT dive watch. Seamlessly navigate different time zones and explore the depths of the ocean with confidence, all while exuding timeless style on your wrist.

Stay tuned for more intriguing insights and tips from Phoibos, where timekeeping becomes an art form.