The listed coordinates are NOT the
coordinates of the cache. You'll need to combine them with the
puzzle below to find the actual cache position, which is within 3
km of the posted coordinates.
Use thousands of UTMs to solve this. East, of course, is
primary, as the direction of the rising sun. From there, turn
counterclockwise.
(-1,0,2)
(-2,-1,1)
(1,2,4)
(0,1,3)
(-3,-2,0)
(-4,-3,-1)
...
(8, 9, 11)
...
The difficulty above is a combination of the difficulty of the
puzzle and the difficulty of finding the cache. Neither, I trust,
is trivial.