Things You'll Need
Instructions
Determine the location of the Sun.
Hold your watch horizontally and point the hour hand to the Sun. If you are in the Southern Hemisphere, point the 12 o'clock mark to the Sun.
Split the angle between the hour hand and 12 o'clock to provide the north-south line. The line between 12 and the hour hand will be south in the Northern Hemisphere, and north in the Southern Hemisphere.