If you have a watch you can get a good estimate of north or south by using the following technique found in many survival books:
Northern Hemisphere: Point the hour hand on your watch towards the sun. South is half way between the hour hand and "12" on your watch.
Southern Hemisphere: Point the "12" on your watch towards the sun. North is half way between the hour hand and "12" on your watch.
This works fairly well (try it!), but I don't know how effective it is if you are close to the equator.
Good luck!
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