Spyglass real use

I was hit with a sudden realization while playing. The spyglass would be significantly more useful if you could place a beacon like marker with it that disappears when you get to it. That way you could climb the big hill, figure out where you're going, Mark it with a beacon you can see from afar, and then journey back thru the Forrest towards it. It would give the spyglass a real use. I'd love to see it. Useful for multi player as well.