You can find the location of the cache by solving the addition problem below:-
TWO
THREE
SEVEN +
-----------
TWELVE
-----------
Each letter represents one of the numbers 0-9.
[There are two possible solutions but either will enable you to find the numbers needed for the co-ordinates.]
The cache is at N54 EH.W(L+1)V, W001 TS.VTT
You can check your answers for this puzzle on Geochecker.com.