At the listed coordinates you will find a park rules sign but no cache. Note the phone number on the sign.
Use either of two methods to determine the actual coordinates of the cache.
Option #1: Certitude method
Enter the phone number exactly as it appears on the sign into the Certitude checker. The cache coordinates and a hint will be displayed if the phone number is entered correctly.
You can validate your puzzle solution with certitude.
Option #2: Projection method
Let the digits of the phone number be ABC-DEF-GHIJ
Let X = I+J
Let Y = H+I
Let Z = E-F
The cache container is hidden YZ meters from the listed coordinates at a bearing of XYG.