The coordinates are for the parking, not for the cache.
The Quelm Stone was deposited on its present site by glacial action 14,000 years ago. It was used by Iron Age man to mark the position of the midsummer sunset. Later it was used to mark the boundary between Warfield and Binfield parishes. Today it is used as the starting point for this easy multi-cache which will take you on a 2km stroll around the Larks Hill and West End area to the north of Bracknell.
Larks Hill is a 16 acre (6 hectare) public open space. It was named for the skylarks and other farmland birds on the site. It contains young field trees and an orchard of apple, pear and plum. During the bird breeding season (March - July) members of the public are asked to keep dogs on leads.
The route is suitable for pushchairs, though be warned that a short stretch is beside a busy road.
The final cache is a small container, 16x8x5cm. The cache is located at N51*AB.CDE W000*FG.HJK.
To read more about the interesting history of the Stone, first visit the noticeboard at N51*25.774 W000*44.934. Here you need to find the estimated weight of the Stone in kg. This is J15K.
Wander over to N51*25.843 W000*44.933. Find the number of the apple tree named after Rev. W. Wilks. This is D. It was first recorded in 19H4.
This isn't a clue, but you wouldn't want to miss viewing the Stone, would you? It's located at N51*25.805 W000*45.023. The co-ordinates on the noticeboard seems to be a little out: it looks like the correct 25' 48" was turned into a very incorrect 25' 43". The OSGB ref is a little more accurate.
After viewing the Stone, make your way over to N51*25.776 W000*45.057. There you'll find the number 1F6.
At N51*25.855 W000*45.124, look at the horizontal barriers. The number of red squares minus the number of white squares is A.
Move on to N51*25.863 W000*45.243. The number on this pole is E.
Have a look at the name of the house at N51*25.918 W000*45.348. The number of letters in the last word is C.
At N51*26.051 W000*45.299 you'll find the number RG42 B6.
The number of letters in the last word of the building at N51*26.141 W000.44.975 gives you G.
You now have all the information to locate the cache. From the cache it's an easy stroll to the car park, passing the Quelm Stone again on the way.