This is a mystery cache. The cache is NOT at the posted co-ordinates.
I had the idea for this code when trying to solve another mystery cache. The clue was that it was inspired by something the owner carried in their pocket. (I never did solve that one, but hopefully it's a good clue for this one!) Note that I've given you some of the numbers in the final co-ordinates.
North GHI GHI 1 DEF. MNO TUV 1
West PQRS MNO DEF MNO. MNO 0 0