I happened across GZ whilst walking the dogs and thought it was an excellent place for a cache. Unfortunately, or perhaps fortunately, I can't place a cache here, so it has to be an offset multi. At GZ you will find nine numbers, call them in order A B C D E F G H J.
The cache is at N 50 (G+D)(J-G).(A-F)(B+F)(B+G) W004 (E-G)(J-B).(H+F)(C+H)(C+D)
If you've walked to GZ, and you must have done, then the walk to the cache will be no problem, just avoid the direct route.