Davosa Watch Ternos Ceramic GMT Tri Bracelet 16159090. A GMT watch is one equipped with a GMT function, which shows a second time zone in addition to your current time. In recent years, this function has become one of the most popular additional functions of mechanical wristwatches. It was therefore a logical move for Swiss watch manufacturer DAVOSA to equip its successful Ternos Ceramic series with this sought-after function. So whether you wish to check if the person you need to call in Asia is still awake, or work out when is the best time to call home when abroad: these are just two examples of why a GMT function more than proves its worth in our globally networked world.