The coordinates given are not the cache location. They are for a building which is visible from near the cache location.
The cache is located at the following position:
N51 A.B W000 C.D where A, B, C and D must be decoded from the following:
The path to the cache can be quite muddy.
Snyyra gerr gung yvrf crecraqvphyne naq jrfg bs cngu, orgjrra cngu naq qvgpu.