In attempting this cache you will need to use a water craft of some description. Please ensure you take all the appropriate safety precautions. Given the possibility of damp conditions, take the time to reseal the bag and tighten the container lid.
Fill in the missing spaces with numbers 1 through 9. The numbers in each row must add up to the number in the right-hand column. The numbers in each column must add up to the number on the bottom line. The numbes in the corner-to-corner diagonals must add up to the numbers in the upper and lower right corners.
Once you have solved the puzzle the letters will give you the final location
N 54 06.ABC W 6 41.D(E+F)G
You can check your answers for this puzzle on Geochecker.com.