You need to collect information from 4 of the GZs whilst you complete the Hanwood Hike series.
The first is #2 - looking at the plaque at the bottom of the wall what is the missing digit from the year (19*2) this gives you digit C
At #3 - just beyond the cache to your right is a plaque noting the Hanwood Parish boundary, what is the missing digit from the year (19*3) this gives you digit A
At #6 - there is a phone number, what is the first and last number NOT including the area code? The first gives you digit E the last gives you digit B
At #11- just over the road there is a STW sign, how many 4's are in the phone number? This gives you digit D
This is the code you will need for the final coordinates
N52 DC.BDD W002 DA.EDC