From Beyond Mission.

The direction which the player is facing upon entering the mission is not a "map." It is a direction. From the direction the player is facing upon entering the mission, the tombstone is northwest. From the map, the tombstone is in the north-northeastern part of the graveyard. Saying "of the graveyard" makes the directions contingent on the geography of the area (i.e. the map); however, the given directions are actually contingent on the direction the player is facing upon entering the mission. Thus, the given directions are inaccurate. Accurate directions would be "head northwest from the direction you are facing when you enter the mission" or "head to the north-northeastern part of the graveyard."