Park at N52° 05.974 / E05° 38.593 and follow the yellow route until you find the 'Centre of Holland'.
How many big stones do you see (#stones)?
Now proceed to N52° 05.(#stones * 302) / E5° 39.(#stones * 201) and determine the number of chutes (Ned: stortkokers) (#chutes). (Beware, the environment changed: #chutes = 2)
Go direction west down through the valley and count the number of wooden beams (Ned: balken) (#beams) that cover the bridge (the ones you are standing on). Beware: if the path is inaccessible then go around!
The final destination is at:
N52° 05.(40*#stones + 30*#chutes + 5*#beams) + 517
E05° 39.( #stones *#chutes *#beams) + 82
After you have found the cache, for a nice walk go up the hill and follow the narrow track on the right back to the parking place.
Good luck!