This method is simple to use and works both in the Northern and Southern hemispheres. Apparently if there is an overcast and no shadows can be seen, this method of finding direction may not work. Also, for this method of finding direction to work effectively, you should be in flat terrain, rather than in a mountainous terrain.
This technique can be used while in mountain terrain providing you have a good, flat open space to cast shadows.
Stay Prepared! Stay Alive!