The given coordinates are not the location of the cache.
In the park between Kalkumer Feld and Falken Weg in Erkrath it is possible to find some interesting structures recalling ancient menhir. The the coordinates of each location are:
A) N 51° 13.009, E 6° 55.118
B) N 51° 13.005, E 6° 55.211
C) N 51° 12.927, E 6° 55.192
D) N 51° 12.903, E 6° 55.079
At each location the number of stones shall be counted (they aren't all visible in the photos), the numbers are needed to find the coordinates of the cache with the below formula:
N 51° 12.(544 + A + B*C*D) , E 6° 55.0(A + B + C*D - 12)