Far North Sudoku Puzzle 1 (Far North) Mystery Cache

This is our first (perhaps there will be more if you like it) sudoku puzzle cache in the Doubtless Bay area.

The listed co-ordinates are fictitious being out to sea on Doubtless Bay.

Complete the sudoku below

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  (D4)(C5).(G8)(H1)(I8)

E173  (F8)(E8).(C3)(B4)(H2)

Checksum for South is 25, for East is 31

The cache is a 500ml plastic screwtop container with room for small swaps. The dificulty rating is based on a difficulty of 2.5 for the sudoku puzzle and 1.5 for the cache. Accessing the GZ will likely require a 1.5km return walk along a relatively level path from a suitable carpark.