The geocache is not at the listed coordinates, but on most Monday's, you may see me there having a bite to eat before hosting trivia nearby. To get the coordinates to the geocache, you need to complete the Adventure Lab - deepdish23's Trivia Haunts. Each location, you will receive a code word. The code words will help you determine what you need to enter into Certitude which will reveal the final coordinates to the geocache. Also once you receive the coordinates, you will get a hint as to the location to the geocache.
You can validate your puzzle solution with certitude.