A GMT watch, or Greenwich Mean Time watch, is a watch that displays the time in two or more time zones simultaneously. GMT watches are popular among travelers, pilots, and other professionals who need to keep track of the time in different parts of the world.
The best GMT watches are accurate, reliable, and easy to use. They typically feature a rotating bezel that can be used to set the second time zone. Some GMT watches also have a 24-hour hand that can be used to track a third time zone.