Nothing at the above coordinates. You need to solve the puzzle below, Knightoku.
Knightoku is a Sudoku style puzzle, with an extra rule based on the Knight moves in Chess. 2 tiles, a chess knight’s move away (ie. L shaped) can NOT contain the same number. Also this Sudoku puzzle, as you can see, has no 3x3 blocks, only rows & columns that each must contain numbers 1 to 9.
A=purple B=red C=pink D=yellow E=blue F=green
The cache is hidden at the following coordinates:
N53° 22.(D-E+A) (C*F) (E-C+B)
W6° 15.[(A*B)-D] (D+F-C) (A-F)
Enjoy!