A memorial is located at the posted coordinates. Locate it and find the 4-digit number on the plaque. Use the 4-digit number to complete this short multi-cache.
The cache is located at N41 44.ABC W088 17.XYZ
A = Ten minus the 4th digit
B = 3rd digit minus five
C = 3rd digit
X = Ten minus 3rd digit
Y = 2nd digit
Z = 4th digit minus two