This is a letterbox, please don't take the stamp
At the listed coordinates you will find a trail sign at a trail intersection. Clues on the sign will give you the letterbox location.
The final is at:
N39 34.9GC W84 46.7KD
Placed with ODNR permission, permit # HW3
The trail is listed at a total distance of 1.K miles
On the trail sign there are G intersections shown
A = distance between E and F = 0.A miles
B = distance between C (the sign you are at) and B = 0.B miles
C = A+B
D = A-B
Sum check = K+G+A+B= 11
Placed with ODNR permission, permit # HW3