Count the digits from the left
The cache can be found at N 44 53.ABC W 93 25.DEF where
A = the number of letters in the word in the upper right corner.
B = the third digit of the year of the wife's birth.
C = the number of letters in the wife's first and middle names as listed on the stone.
D = the fourth digit of the year of the husband's birth.
E = the number of letters in the word in the upper left corner.
F = the second digit of the year of the husband's death.