Skyline Walkway Bonus Cache (North Otago) Mystery Cache

This is the bonus cache which can be found after you have collected all the codes from the 9 caches placed along or near the Skyline walkway. Bring your own pen or pencil. It is not at the published coordinates.
The Skyline walkway traverses Waitaki District Councils reserves. There may be sheep grazing in these reserves and dogs must be on a lease. Take particular care during lambing time August to September.
The bonus cache is located at S 45 0R.STU E 170 5W.XYZ
BYOP to sign the cache.
Where
R = F-B
S = G
T = J+B
U = K-A
W = D-A
X = E+I
Y = C-A
Z = H-C
Checksum R+S+T+U+W+X+Y+Z = 40