The Rolex GMT-Master was originally designed for professional use to aid airline pilots. However, its combination of peerless functionality and instantly recognizable aesthetics has attracted a wider audience of world travellers. Designed to show the time in two different time zones simultaneously during intercontinental flights, the GMT‑Master has come to be recognized for its robustness and versatile appearance. The GMT-Master II evokes intercontinental travel across time zones. Greenwich Mean Time (GMT) marks mean solar time at the Royal Observatory in Greenwich, London — the location of the original meridian used for calculating longitude and determining different time zones around the world.