Full details at for all series at GC6D3PK TT 01
Follow the diagonal footpath across the field to the coords. At the coords, you will find the answers to the below Qs, then follow the footpath out onto the road and then find your way to the next footpath.
So the Qs to get your coords, from the footpath post...
A = how many round yellow discs
B = how many total arrows
C = how many arrows on each side of the post (the sides that do have arrows)
D = the last digit of the top ZR code
E = the last digit of the bottom ZR code