Slitherlink Honeycomb Mystery Cache

I recently checked to see if I had missed any tiling patterns, and I realised I had missed Honeycomb tiling. Unsurprisingly, cells in the honeycomb tiling are hexagonal.

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. Locate the letters a through to n in the puzzle (i and l are omitted). For each letter, its numeric value is the number of lines around the cell.

The original cache coordinates were S 43 30.ABC E 172 34.DEF, where:

A = a + b
B = c + d
C = e + f
D = g + h
E = j + k
F = m + n

The checksum for A to F is 22.

The current hiding place is a short distance away from the original one (add 0.006 to the South minutes, and subtract 0.012 from the East minutes).

The cache is a 200ml sistema inside a black camo back. With your back to the corner of the building, walk diagonally away from the building, and look behind a shrub with multiple (spindly) trunks.