Why should you always carry a watch when crossing a desert?

Carrying a watch when crossing a desert is essential for keeping track of time and managing your journey effectively. It helps in planning your travel during cooler parts of the day, avoiding the extreme heat of midday. Additionally, knowing the time can assist in navigation and ensuring you have enough daylight to reach your destination safely. A watch can also serve as a psychological tool, providing a sense of routine and control in an otherwise challenging environment.