Step 1. Solve the crossword puzzle here.
Step 2. Multiply together the number of N's, C's and U's in the completed puzzle grid, that is, n*c*u where n= the number of N's, etc. That is a 4-digit number representing the last four digits of the North coordinates, i.e the X's in N37 2X.XXX.
Step 3. Next total each S, E, A, and H as one group, then do the same for R and L. Multiply those two totals, i.e. (s+e+a+h)*(r+l). That result is a 4-digit number representing the last four digits of the west coordinates, i.e., the X's in W122 0X.XXX.