18
I decided to take some time off from placing caches and played a round of golf with a few friends. The score is circled if the score was under par and has a square if when over par. I will upload a copy of our scorecard which you can use (along with some simple math) to determine the coordinates to this cache.
The cache is located at N 39 MN.OPQ, W 096 RS.TUV.
M = G - D
N = A - F
O = H - C
P = G - B
Q = C + E
R = C - A
S = E + G
T = F + A
U = D + F
V = D - E

You can check your answers for this puzzle on GeoChecker.com.