Next to the Donnybrook Legion I have hidden a simple multi-stage cache.
Examine the wall sign on the building and calculate the location of the final.
Now calculate
A = X + Z
B = X + Y + Z
C = X + Y - Z
D = X + Y
E = X + X - X
F = Y + Z
The final can be found at N 42° 57.ABC W 081° 03.DEF.