At the published coords you will find a small round sign.
There are 6 words on the sign, counting from left to right, top to bottom. Count the letters and allocate them to A-F
The cache can be found at N50 51.CA(C-B) W001 09.A(E-D)(C-F)
Checksum of ALL numbers in the coordinates = 50.
When you get to GZ, where you need to go should be obvious, you're looking for a small bison container tied with fishing wire.