I agree with tinhorn, boot leather will teach more than classrooms, I know that there's LOT'S of folks out there that don't agree with me BUT have you ever seen a tree after its been hit by lightening, forest fire, wood for a fire, logs for a house, I rather follow a carving in stone, KGC, outlaw, cut a limb off a tree and you have a marker that will serve for many years to show the direction and usually the distance will be shown from the limb to the ground or just walk the direction it shows until you come to a flat rock or something, Who knows to could be a Spanish settlers ( aprox ) 110 troy oz ( 454 grams ) The limb may look like an old broke off limb or ax will do a pretty good job and may only be 12 ft high one horse and 1 man = 12 /15 ft