"Better Be Ready” to find this by first finding the cache Colourful Bison ( GC5BMY2 ) in Vineyard creek reserve. This is a straightforward puzzle but you may find that “Your Great Big Plan Goes Wrong" if you are not careful
Once you find the Colourful Bison, take a very good look at the rings on it. Sometimes it’s difficult to see the colours clearly; so to make things less confusing I will say that I have NOT used GREY, YELLOW or SILVER. It’s just that sometimes white gets discoloured and it’s hard to see when you don’t have adequate sunlight.
The 4 rings are A B C D
P= (D+1) + (D+4 -C)/2
Q=C-6
R=C-5
X=B
Y=A-3
Z= ( 2 + (D+4 -C) x 3 ) + (D+4 -C)/2
The caches is at S 33 47.PQR E 151 01.XYZ