Use of geocaching.com services is subject to the terms and conditions in our disclaimer
At the posted coordinates, you'll find what should be an obvious object. Centered on it, is a four digit number. Call that number ABCD.
You'll find the final a short distance away on a related object at the following coordinates:
N 42* 04.CBA W 087* 59.[A-D][C-A]B
TCF znl or n yvggyr whzcl va guvf nern. Purpxvat gur fng. cvpgher znl uryc.