Slitherlink Rectangular Grid (13x13) Mystery Cache

After doing the boot camp, and an easy 6x6, it's time for something a bit more challenging. Will 13x13 by lucky for you?

To work out the location of this cache, you need to do the following:

1. Solve the puzzle below (see the cache listing for Slitherlink Boot Camp for the rules about how to solve Slitherlink puzzles).
2. Write the letter A next to the top row, B next to the second one and so on (until you get to last row, which is row M).
3. Write the number 1 above the left column, and continue across until you write the number 13 above the right column.
4. You now have a way of identifying each cell in the grid. For each cell, its numeric value is the number of lines around the cell (which means each value is between 0 and 3). As an example, the value in E3 is 1. Use cell values in the formula below to work out the cache coordinates.

The cache can be found at S 43 29.UVW E 172 34.XYZ, where:

U = E10 + J4 + L13
V = K8 + D5 + G4
W = G9 + J2 + D2
X = E11 * M11 + D9
Y = H5 + B8 + C4
Z = K2 + D4 + F8

The checksum for U to Z is 17.

The cache is in a black camo bag, and is about 200ml in size, tucked into a natural slot (please cover the gap well when replacing the cache).