To go from a heading G to a magnetic direction AM (and the opposite) you will need to draw this diagram.

You need to check your magnetic direction and your heading on this diagram using the definition of a walking angle:

• Heading G is the angle between the Lambert pole Y and the direction you want to follow.

• The magnetic direction AM is the angle between the magnetic north and the direction you want to follow.

Therefore you can draw these two angles using the examples below :