You'll need to keep your wits about you on this hunt.
There are two phases to this cache:
1) Find her standing in silence @ N43d 01.997' W076d 04.769' - her gaze marks your path.
2) Walk as she watches; 50 paces separate you from where she stands to where you are heading. John & Grace await you.
3) Long lifes they lived - what is the sum of their life spans? Confused are you?
5) After completing these steps and noting the sum, you may proceed to the cache.
ENJOY!!
Pbashfrq? Ure tnmr ybbxf qhr abegu gb n fznyyre fgnghr. Gur zngu vf hc gb lbh, ohg lbh jvyy ARRQ gur nafjre. Nsgre chggvat njnl lbhe pnyphyngbe, cebprrq hc gur uvyy gb gur pnpur pbbeqvangrf.