At the posted coordinates you will find a light post with various numbers on it.
Assign the 3 digit red number to the following letters ABC
Assign the 4 digit JOB # to the following letters DEFG
The final stage for the cache can be determined as follows:
North : 43 5(E-A).(A)(F-C)(C+D)
West : 079 1(C).(C+D)(D-G)(A)