The things you find in the middle of the bush. This is the second one of these I have seen and the other one isn't too far away. I wonder if there are more? To find out what is here, you'll have to make the trip.
Once there, make the following observations:
A = The number of horizontals in one fixed panel
BC = The number of fixed panels
D = The number of non-fixed panels
Then find the cache at:
S 35 42.AB1 E148 47.(A+B+D)C0
FTF was Tankengine