The cache is NOT at the posted coordinates. You must solve the puzzle to reveal the actual coordinates.
I find that geocaching and puzzling, like many other activities, are more enjoyable when done with a friend. Consider inviting one to join you for this one!
You can validate your puzzle solution with certitude.
This is my first puzzle cache - I hope you enjoy it! Thanks to jeremiahsjohnson and kablooey for testing and suggestions. As with any of my puzzles, I'm happy to provide nudges if you need them and let me know what you've tried so far.
Congratulations to thanman2 for FTS and FTF!