Cub will hold the Silva Compass in front of them in the direction of travel then move to get the compass pointing to magnetic North.
Silva Compass. (or any compass with appropriate markings.)
Hold the compass in both hands so that the writing is face-up, the compass level and the 'direction of travel' arrow is pointing ahead of you. The red end of the needle will swing round and point to magnetic North. Turn your body round until the red of the compass needle covers the red arrow. You are now facing magnetic North.