The cache is of course not at the published coords, its a puzzle or course!. The Railfence cipher is rather easy, simply look on tin'ter-web and i'm sure you'll find out how to do it. If not, the basic principles are in allot of books on cryptography.
Tweezers might help those with chubby fingers to retrieve, but I managed and mine are rather impressive in girth.
FTF:- forcesofnature, well done on a ftf after a long cache break!