How-to Operate Your GMT Watch

Your watch is mechanical. The Oceanguard houses a trusty Seiko NH34 GMT movement and is therefore an automatic. This means as you go about your day, the natural motion of your body will keep your watch wound and running. This also means your watch will begin to tick/operate even after sitting for a period of time simply by picking it up, strapping it on, and getting moving. However, for best timekeeping results it is always best practice to fully wind your watch after it has been sitting and lost its power reserve.

To do this, simply un-screw the crown until it pops free of the case (you should be able to depress it and feel it give and push back freely with a simple push towards the case). This is Position B detailed below. From here you can manually wind your watch by spinning the crown clockwise (CW), away from your body. Give the crown anywhere between 30-50 turns (one full turn is achieved with each complete rotation of the crown, but don't over think this step! Just wind and count!). Congratulations, your watch is now wound!

Once wound, go ahead and give the crown a pull until it pops into the next position (Position C above). This is the GMT hand AND date setting position. From here, turn the crown counterclockwise (CCW) to set the date and CW to advance the GMT hand. After setting, the GMT hand will operate in concert with the hour and minute hand keeping track of your chosen second time zone.

Finally, give the crown one last gentle pull until it pops into the time setting position (Position D above). This is the furthest you can extend the crown away from the case and DO NOT use too much force or attempt to pull the crown out further than this point--if it does not feel like it wants to go, then it probably shouldn't go. From here, turn the crown CW away from your body and set the time. Avoid setting the date and time between 9PM and 3AM for best results and longevity of your watch. Once the time is set, simply push the crown back to Position B (it will pop into place) and then depress and re-screw down your crown (DO NOT forget this step as it ensures the water resistance of your timepiece).

One more important thing to note about timekeeping with a GMT watch is that the GMT hand moves at half the speed of the hour hand. What this means is that the hour hand will travel 2 times around your dial over 24 hours, while your GMT hand will only go around 1 time over 24. Put differently, think of the hour hand going around twice a day, first as A.M., then again as P.M. The GMT hand only goes around once in that day and points to a scale from 0 to 24 shown on the bezel. For this reason, do not be alarmed when the GMT hand does not appear to move at the same speed as your hour hand while keeping time. And because the GMT hand does not turn at the same speed as the hour hand it should not be used as a reference using the hour markers on the dial to tell your second time zone, use the bezel numbers instead (see video linked below for additional info as needed).

Now, people often ask, do you really need to wind your automatic watch? I mean, it is an automatic after all. The answer is truthfully, no, BUT if you want any sort of decent results when it comes to keeping accurate time from your watch you are best off winding it and keeping the main spring tight. Nick from Orion Watches has an excellent video explaining just this fact, be sure to check it out below!

Another bit of horology knowledge when it comes to automatic watches, or at least this automatic watch, is that you cannot overwind the movement. So wind up, screw down that crown (always remember this step after winding!!), and get to enjoying your new watch!

Helpful videos:

Do you need to wind your automatic watch?

How to use a GMT watch?