TAG Heuer Aquaracer Professional 300 GMT Bracelet WBP2010.BA0632. The TAG Heuer Aquaracer Professional 300 GMT, a fresh take on the luxury toolwatch that is designed to go beyond the edge, any place and any time. And now comes another chapter with a clean, colorful take on the GMT function. The TAG Heuer Aquaracer Professional 300 GMT is the ultimate go anywhere watch, a powerful and yet hugely versatile design created to cross time zones and dive and surf all over the world.