While working on another puzzle cache, I found that I'd made a mistake in one of the clues. Rather than discard it, I retooled it to work as a cache on its own.
The picture above tells you exactly where to look. (Don't read anything into it; it's just a clue for a puzzle.) At this location you will find a pole with an identifying number on it. Using ABCDEF as the digits in this number calculate: G = D + E + F + 1 and H = 2 * F. The last three digits of the west coordinate is CGH.
Straight down from the tag with the identifying number you will find an 11 digit number. The center three digits of this number are the last three digits of the north coordinate.
You can validate the final cache coordinate certitude.
The final container is small enough to contain only a log, but may be enlarged later.
Congratulations to 7ofclubs and Lord Mot for co-FTF on a difficult puzzle cache.