The cache is not at the posted coordinates, however it is within 1 kilometre (as the crow flies).
Additional Important Information:
1) Each square in the crossnumber grid contains a single digit.
2) None of the squares contain a zero.
3) Different letters do not necessarily represent different digits.
4) There are exactly four squares that contain even digits.
5) There is only one correct solution.
The actual coordinates of the cache are N43 51.pqr W79 06.stu, where
p = ( B + E ) - ( F - I )
q = ( D + H ) - ( G + J )
r = ( A x J ) - ( B x C )
s = ( F + I ) - ( C + D )
t = ( H + I ) - ( A + E )
u = ( E + G ) - ( B + J )
Enjoy!