The cache is not at the posted coordinates.
Go there and look around. Without going very far, you should find yourself at the location shown in the picture. When you do, use the information that is hidden in the photo to get your numbers.
When you find the missing information, use a little math to figure out the final coordinates.
N 42° 48.XYZ W 086° 06.ABC
A 3rd digit of the year he/she died
B 4th digit of the year he/she died
C sum of the digits of the year he/she died
X sum of the 1st digit and the last digit of the year he/she was born
Y sum of the 1st digit and the 3rd digit of the year he/she died
Z (day of death - day of birth) / 2
Checksums 14, 12