An easy one for our 18th puzzle cache:-
-3 +4 -1 -4 -1 +3 -1 -3 -4
-3 +2 -1 -4 -4 -4 -1 +2 -4
Click
to verify coordinates
Have fun.
Update: I have been told one number could be out due to
differences in versions of the information needed to solve this.
However, the error should be obvious and easy to correct