If you aren't familiar with this kind of puzzle, you may want to try solving GC61BVX: (NSML02: a Micro Logic Tutorial) or GC65G5M (NSML08: An after-dark micro logic) first.
You can get the coordinates by solving the following: The nine letters (A, B, C, D, E, F, G, H, J) represent the digits from 1 to 9. No two letters are equal. "B*A" represents multiplication and "BA" represents a two-digit number. So if B=6 and A=3, then BA=63 and B*A=18.
JHEC = AFB + ADG
BC = AD + JJ
The geocache is hidden at N 45 05.X, W 064 23.Y, where ....
X = HGE-JDA and Y = JCA+DFB
You can validate your puzzle solution with certitude.
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