The cache is obviously not at the given coordinates. You will need to solve the puzzle below to determine the final coordinates.
Note: in the puzzle every column and every row must contain the digits 1 to 7. Furthermore each set of linked circles must also contain the digits 1 to 7.
The correct coordinates are:
S 26 [G6-C1][[A2}.[B7][[G1-B5][F1-B4]
E027 [F2][G7].[[E1+D6][G4][[D7]
Happy Hunting!
You can check your answers for this puzzle on:
NOTE: You need to climb up a rather steep uphill towards the cache. Please take care that you don't slip and fall, it could be a nasty one!