At the end of the day, trying to hit something bang on using a compass bearing alone over distance in testing conditions and wild terrain isn't as easy as the text books suggest and requires more tools in the navigation skills tool box to be used to get it right, ie, aspect of slope, using the contours, aiming off, target approaches, handrails, time and distance, tick off points, etc - you get a group of students to undertake the same leg between two features using a compass bearing and they will all have different outcomes - keep it simple.