Initial Magnetic Bearings

When leaving a waypoint on your route to walk to the next one, it is important to select the right path from what may be a number leading away from where you are.  To do this, you have to calculate the initial magnetic bearing, i.e. the direction that you walk initially.  This is not the same as the direct bearing from A to B.
 
In this example the red arrow shows the direct bearing from the junction of footpaths to the Woolpack Inn and the blue arrow shows the one closest to the direct bearing that you may be tempted to follow, for instance in thick mist.  Your initial direction, however, should be the purple one, which is along the path that will eventually take you to the Woolpack Inn.