This is a bonus cache to accompany the Adventure Lab caches, BANDERA, COWBOY CAPITAL OF THE WORLD!! YEE-HAW.
No need to go to the posted coordinates unless you are looking to go swimming in the Medina River. You will need to complete the Adventure Lab and pay attention to get the answer needed to unlock certitude and get the coordinates for the final. Hope you enjoy your time in Bandera and that you are able to learn a little about THE COWBOY CAPITAL OF THE WORLD.
You can validate your puzzle solution with certitude.