How to Use the OMEGA Aqua Terra Worldtimer
May 18, 2026
Learn how to use the OMEGA Aqua Terra Worldtimer, including the 24-hour disc, city ring, local hour hand, date setting and daylight saving time.
How to use the OMEGA Aqua Terra Worldtimer is a question that comes up often because the dial looks busy at first, but the basic idea is simple once you know what each part is doing.
It is not just a GMT watch. A GMT watch usually tracks one additional time zone. The Aqua Terra Worldtimer lets you read the time across multiple global time zones using the city ring and 24-hour disc on the dial.
That makes it one of the most useful complications in the modern OMEGA Seamaster range, especially for travellers, collectors, or anyone who likes a watch with real function behind the design. The basic layout is the same across the Aqua Terra Worldtimer collection, whether you are looking at the familiar blue-dial version or the lighter titanium model on rubber. The visual character changes, but the way the watch is read and set remains the same.
To use the OMEGA Aqua Terra Worldtimer, first set the 24-hour disc to UTC using crown position 3. Then use crown position 2 to adjust the local hour hand in one-hour jumps. The central hands show your local time, while the city ring and 24-hour disc show the time across global time zones.
Once the watch is set correctly, you only need to adjust the jumping hour hand when travelling.
The Aqua Terra Worldtimer shows three key things at once:
Your local time is read in the normal way using the central hour and minute hands.
The world time function is read using the outer city ring and the 24-hour disc. The city ring represents major global time zones, while the 24-hour disc allows you to read the approximate time in each of those places.
London is highlighted in red on the dial because it represents Greenwich Mean Time, now more formally known as UTC, or Coordinated Universal Time. You will also see Bienne on the dial, which is OMEGA’s home city in Switzerland.
At the centre of the dial is one of the watch’s most recognisable details: a view of Earth from above the North Pole. On the titanium version, this is created by laser-ablating the continents and colours onto a grade 5 titanium surface. It gives the watch its visual drama, but the real function comes from the relationship between the city ring and the 24-hour disc around it.
The 24-hour disc is the key to the Worldtimer display.
Instead of using a normal 12-hour format, it shows a full 24-hour cycle. This matters because it tells you not just the hour in another city, but whether that place is in the day or night part of the cycle.
Once the watch is set correctly, you can look at a city on the dial and read the corresponding time against the 24-hour scale.
For example, if you are in London and want to know the time in Hong Kong, you look for Hong Kong on the city ring and read the time from the 24-hour disc next to it.
That is the main advantage of a worldtimer over a standard GMT watch. A GMT watch is excellent if you mainly track home time and local time. A worldtimer is more useful if you regularly think across several places at once.
Setting the Aqua Terra Worldtimer is not difficult, but it needs to be done in the right order.
The important thing is to set the universal time display first, then adjust the local hour hand afterwards.
Pull the crown out fully to position 3.
This position controls the minute hand and the 24-hour universal time disc.
Turn the crown to move the minute hand and the 24-hour universal time disc forward until they correctly indicate UTC time.
UTC is the reference point for the world time display. On the dial, London is highlighted in red because it represents this reference point.
This is the part you want to get right. If the 24-hour disc is not correctly aligned to UTC, the world time display will be wrong.
Once the minute hand and 24-hour disc are correctly set, push the crown back in to position 1.
This restarts the movement.
Now pull the crown out to position 2.
This position controls the local hour hand.
The useful part is that the hour hand moves forwards or backwards in one-hour jumps. That means you can adjust local time without disturbing the minute hand or the world time display.
Use the jumping hour hand to set the date.
Move the hour hand forwards or backwards past midnight until the correct date appears.
Pay attention here. The date changes at midnight, so make sure you are setting the watch in the correct half of the day. If you accidentally set it 12 hours out, the date may change at midday instead of midnight.
Once the date is correct, keep moving the hour hand until it shows your local time.
The watch is now set.
Your central hands show local time. The city ring and 24-hour disc show the time across the other global zones.
This is where the Aqua Terra Worldtimer becomes especially useful.
Once the watch has been set correctly, you do not need to reset the whole world time display every time you travel. You only need to adjust the local hour hand.
If you are travelling from London to Hong Kong, pull the crown to position 2 and move the hour hand forward by 8 hours.
The central hands now show local time in Hong Kong.
The 24-hour disc still lets you read the time back home in London at a glance.
If the hour hand crosses midnight while you are adjusting it, the date will jump forward automatically.
If you are travelling from London to New York, pull the crown to position 2 and move the hour hand backwards by 5 hours.
The central hands now show local time in New York.
Again, the 24-hour disc still allows you to check the time in London or other cities.
If the hour hand crosses midnight backwards, the date will move backwards too.
That is one of the most practical features of the movement. You can travel between time zones without stopping the watch or disturbing the minutes.
Daylight saving time is the one thing to keep in mind with any worldtimer.
If a city or region is currently using summer time, you need to add one extra hour to the time shown on the watch for that location.
This is not a fault with the watch. It is simply because daylight saving rules vary around the world and change depending on the time of year.
For example, London may represent UTC on the dial, but during British Summer Time, local UK time is UTC plus one hour.
So if you are using the Worldtimer seriously while travelling, always check whether the city you are reading is currently observing daylight saving time.
A GMT watch and a worldtimer are often confused, but they are not the same thing.
A GMT watch usually tracks one additional time zone. This is often done with a 24-hour hand and a 24-hour bezel or scale.
A worldtimer shows multiple global time zones at once.
That makes the OMEGA Aqua Terra Worldtimer more visually complex, but also more informative. It is designed for quickly checking the time across several cities rather than just tracking one extra location.
If you only need home time and local time, a GMT watch may be simpler. If you like seeing the whole world laid out on the dial, the Worldtimer is far more interesting.
The Aqua Terra Worldtimer stands out because it combines a genuinely useful complication with one of OMEGA’s most distinctive modern dial designs.
The titanium version, reference 220.92.43.22.99.001, is especially interesting because it gives the watch a more technical, travel-focused character.
Key details include:
The blue-dial version is probably the more familiar Aqua Terra Worldtimer, but the titanium model has a very different feel on the wrist. It is lighter, more modern, and more tool-like, especially on the integrated black rubber strap.
Both versions use the same core idea. The city ring, 24-hour disc, and central Earth display work together to create a watch that is visually dramatic but still practical.
Yes, once you understand the logic.
The first setup takes a little care because the 24-hour disc needs to be aligned correctly with UTC. After that, daily use is straightforward.
The independent jumping hour hand makes travel easy because you can change local time in one-hour increments without stopping the movement. That means the minutes, seconds, and world time display remain accurate while you adjust to a new destination.
The only real thing to watch is daylight saving time. Because different countries change clocks at different times, you may occasionally need to mentally add one hour for cities observing summer time.
The Aqua Terra Worldtimer makes sense for someone who wants more than a standard three-hand watch but does not want something purely decorative.
It is useful if you travel regularly, work across different time zones, or simply enjoy the mechanics of global timekeeping.
It also suits collectors who like watches with a strong visual identity. The world map, city ring, and 24-hour display make it instantly recognisable without relying on size or loud design alone.
The titanium version adds another layer to that appeal. It feels lighter and more contemporary than the classic steel models, while still keeping the core Aqua Terra Worldtimer character intact.
The OMEGA Aqua Terra Worldtimer is one of those watches that looks more complicated than it actually is.
Once you understand the city ring, 24-hour disc, and jumping local hour hand, the display becomes much easier to read. Local time is shown by the central hands. World time is read from the city ring and 24-hour disc. Travel adjustments are handled through the independent hour hand.
That combination makes it one of the most practical and distinctive watches in the modern OMEGA collection.
It is not just a watch with a world map on the dial. It is a proper travel complication, and when used correctly, it is far more intuitive than it first appears.
Learn how to use the OMEGA Aqua Terra Worldtimer, including the 24-hour disc, city ring, local hour hand, date setting and daylight saving time.
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