It was easy to lose one's bearings in the forest as there were no landmarks. People with a poor sense of direction would find it hard to even distinguish between the direction of north, south, east, and west.
Fortunately, Jasper Milton was very sharp in directions and he made marks along the trees as they went.
She asked what the marks meant.
He explained to her in detail that the mark indicated direction and angle. In short, it included the direction the person was standing in and the direction of the time on the watch at that moment.
They would discuss the details with the team members before they began their mission. The rules for every mission were different. Even if the enemy found the marks on the tree, they would not know their direction. Only their members would know the meaning of the marks.