The cache is not at the posted coordinates.
Use the clues on the left to fill in the words to the right. Then transfer each letter to the corresponding square in the diagram. Work back and forth until all the letters are filled in. A black square indicates the end of a word. Words may continue from one line to the next. When the puzzle is completed, just follow the instructions to locate the final.
Only grade school math is required on this one.
BYOP
A FTF Geocoin awaits the FTF.