You can do this with any watch, analog or digital, if it has hour and minute hands. You can recreate hour and minute hands with twigs or stones, but the watch is very helpful. The method described here only works in the Northern Hemisphere. You will also need a watch that is set correctly (doesn’t have to be exact but should be accurate within a couple of minutes). This doesn’t work too well at close to noon or slightly after (so try this before 11am or after 1pm) nor will this work at night, and it is not necessary at 6pm or 6am. At 6pm, the sun is almost setting so the sun will be west, and north will be to the right of you if you are directly facing towards the sun. At 6am, the sun is rising so the sun will be east, and north will be to the left of you if you are directly facing the sun.
Point your hour hand towards the sun. Then, make an imaginary line between the hour hand and 12, and the line outside of that is north. So, if you take a reading at 9am, there will be an imaginary line running straight around 10:30am and 4:30pm. North will be the direction around 4:30pm. Test it with a compass, and you may be surprised how accurate this is.
For Southern Hemisphere, it is the line in between the hour hand and 12. So if you are taking a reading at 8am, point the hour hand to the sun, the line between 8am and 12 is 10am. That direction where 10am is pointing is north.
Hope this is helpful.
