This cache is a companion to GC4Z4NM ("Here's the Windup..."). They are both similar but one is much trickier to solve than the other.
The cache is not at the posted coordinates. You must solve the puzzle below to locate the cache.
Assume N 39o and W084o:
(S + T - Q - X) / 2
(U - X) / 8
2U + 8 - 3S
V - 2Q
(R - S) / 4
S + Y - 2U
U + 2T - 3X
(Y - U - V + X) / 4
(X - T + 2) / 4
Good luck! Note: Daylight hours only, and GZ can be EXTREMELY muggly at times. Use stealth.
Congratulations to gallaghd for a speedy FTF!
You can validate your puzzle solution with certitude.