The Roadmaster Marine GMT features the BALLs GMT quick-set mechanism allowing travelers to easily adjust time zones. Simply by turning and pressing either one of the patented quick-set buttons, the GMT hand can be easily set. The button at 8 oclock moves the GMT hand backward, while the 10 oclock button moves it forward. Combined with a bi-directional 24-hour bezel and main hands, the Marine GMT allows for three time zones to be tracked simultaneously.In the darkest conditions, time can be read thanks to the self-powered H gas tubes carefully mounted onto the dial at each hour marker as well as the main hour hand, minute hand and GMT hand. These micro tubes dont require recharge from any external light or energy source.The Marine GMT features the chronometer certified automatic caliber BALL RR1203-C with day/date functions. It is water resistant to 300m/1,000ft, anti-magnetic to 4,800A/m and shock resistant to 5,000Gs. Its case is made of titanium fitted with a ceramic bezel while its bracelet combines stainless steel and titanium parts. The movement can be admired thanks to a see-trough case back and the crown screws in for better resistance.