Let's review. There are three major steps in using a protractor base compass.
1. Line up the edge of the compass with the line of travel on the map.
2. Rotate the Compass Housing so that the Housing's North Lines are parralell with the Map's North Lines.
3. With the compass against your chest, hold the travel arrow pointing directly away from you. Rotate your entire body until the the compass needle settles inside the confines of the Housing's Orienting Arrow. You are now facing your desired direction of travel.