The listed co-ordinates are fictitious being out in Doubtless Bay.
Solve the sudoku below:-
Then for reference treat the horizontal rows of nine numbers as (commencing from the top row) A1 to A9, B1 to B9 etc.
The co-ordinates of the final are:-
S34 (D2)(I6) . (E4)(B3)(F3)
E173 (G8)(F8) . (G1)(A6)(H7)
Checksum for S is 26, for E is 23.
The cache is a small systema box. Room for a few swaps. Despite the evidence of vehicle tracks in the area of GZ, DOC are undertaking a dune restoration program and do not want vehicles on the dunes. Walkng on the dunes is okay. The difficulty rating allows a factor for solving the sudoku puzzle.