They are used for marking the last definate sign so that when you cast out and try various ways to link with another sign, you know exactly where to come back to. I also put a small scap of paper in a colour contrasting with the ground.
The reason wood is better is because should the worse happen and for whatever reason you can not get back to collect them, they will rot down.
The reason wood is better is because should the worse happen and for whatever reason you can not get back to collect them, they will rot down.
