Another Picture Sudoku Mystery Cache

After solving the sudoku, get the coords using the following formula,
using only the ones digit of each sum. (Example: 5 + 7 -> 2)

N 44° 5(H9).(E1+8)(K1+6)(C7+3)
W 93° 2(A12+9).(D4+8)(E2+7)(K3+1)

There is a one-digit number written on the top of the first page of the log book.
You may want to save that number for future reference.