The cache is not at the given co-ordinates, but is within a mile 'as the crow flies'.
Solving the puzzle below will reveal the location of GZ.
(4)(51)(92)R(39) / (6)(8)M(42)(7)
(56)(6)(19)L(99)(16) / (34)(85) / (74)(53)(90) / A / (23)(53)E(74)
You are looking for a four inch long tube of film canister diameter.
I hope you enjoy the area and the views.
*** Congratulations to Carrog on a swift FTF. Glad you enjoyed it! ***