Reference point 68B
The order remains, long after the meaning is lost.
From about 1980 until his mysterious disappearance in 1992 Bob Tagge lived in a cottage at the Hartekamp estate.
In the vast dune area behind his house he placed a large number of numbered pickets over the years. The reason we can only guess. Possibly the key is hidden in an unexplored part of his archive.
Several dozen poles still stand in an area closed tot he public inhabited by wild bison.