The world is divided into 24 time zones. For easy reference in communications, a letter of the alphabet has been assigned to each time zone (less the letter "I" and "O"). The "clock" at Greenwich, England is used as the standard clock for international reference of time in communications, military, maritime and other activities that cross time zones. The letter designation for this clock is Z, pronounced ZULU in the phonetic alphabet.

Zulu Time Line has 2 distinct models. One uses a turning internal bezel to mark a different time zone (dual time) while the other uses an additional hand completing a full circle once every 24 hours that can also denote a different time zone including Zulu Time (i.e. GMT).

T6 Zulu Time & E6B Combination Watches.

Torgoen T6 series has a Swiss Movement GMT type (additional time zone in 24 hour format, or ZULU time according to aviation radio lingo) and slide rule called flight computer or E6B. With it you can easily solve time, speed and distance problems as well as conversions of units once you know the ratio. Currency conversions are especially easy to perform. You can also multiply or divide any two numbers (detailed instruction manual booklet in 4 languages with many examples is included).

T8 Zulu Time Watches

The T8 models by Torgoen have three separate mechanisms manufactured by Ronda in Switzerland, that operate independently. Each can be adjusted to a different time zone without affecting the other two. This feature proved to be convenient for pilots who need local time, destination time and Zulu(GMT) time.