My favorite is the Shadow-Tip method, in which you push a stick into the ground and then mark the line that the stick's shadow makes as it travels across the ground from west to east. Now stand perpendicular to the line with the west on your left and east on your right and you should be looking at true north.This is good information to know next time your plane goes down in the middle of nowhere. You'll be the belle of the plane crash ball when you start pushing sticks into the ground and measuring the movement of the shadow.