4 Squares Mystery Cache

This cache is NOT at the posted coordinates. If you walk to the coordinates you will be in a farmers field looking for a cache that is not there.

To find find this cache you will need to solve the sudoku to get the coordinates. 

The cache is at North AB CD.EFG West HIJ KL.00M

Here is the sudoku: in the pictures 

You can check your answers for this puzzle on GeoChecker.com.