Periodically, I have been wanting to create a puzzle cache, but I would always table the idea for a better time. The time is now. No additional hints. The coordinates are your only clues. After all, this is a puzzle cache and it should be elementary. Your final coordinates are:
N.Sr.Ar.FC0, W.Tl.Se.ScC
You don't need to take a swim for this cache. The cache is not at the listed coordinates.
And, as always, be aware of muggles.