They eye catcher stone dsty talks about is how I got into trails in the first place. A lot of Kenworthys ideas can be found in the trail. I never thought of looking above the eye catcher, but I do search the area for other clues. If you take what they could travel in a day, its makes sense to me. I dont just follow one trail, but I follow it where ever it takes me. I have found many sites this way, more than 100 people could work in ten years.
I start with what I call far signs, and work my way in. As the signs get smaller(usually), the closer you are. A large elephant can mean a large deposit not just distance. I have followed elephant heads from a large elephant to a pair of owls. This lead to other discovery's.
Ranglers explanation has some truth in it, but not because of a exact distance. Pirates and others did indeed pace off things. I like dsty's explanation as it is something you can see from google earth. Can you imagine how many of these corner stones have been destroyed due to expansion? Its getting harder and harder to find stuff. Not to mention some of this stuff is several hundred years old. As DM says, I try to follow the royal trail as she calls it.

This is one of the first signs I found, its a duck. When I line this duck up with another duck, I get a spot that needs to be looked at real hard. No markers or measurement needed, just a idea of how they did things. The duck is also part of a marker about a 1/4 mile away that is very visible but not easily accessible. This is a real good example of how signs will lead you away and into harms way. The big round egg lookingstone is also about the same distance as the marker with the duck. This spot actually leads to two different spots.

This is one of the egg shaped stone. I believe its size will convey a distance dsty has talked about. No reference in picture, but this is large. There is actually two of them very close together, not sure what that is about.

This is a large elephant I mentioned earlier. I cant really show the eye catchers or the elephant heads I have enough company out here.