This is a challenge cache. The cache is at the posted coordinates. Cache hunters are welcome to sign the log at any time but cannot log this as a find until they complete the challenge.
The challenge: Add the number of “Wireless Beacon,” “Stealth Required,” and “Field Puzzle” attributes you’ve found. To meet this challenge, your total number must be greater than or equal to 500.
As of 17 Aug 2019, I have found 555 of these attributes. You can use the challenge checker to verify this for yourself.
The Project GC Challenge Checker will verify you qualify; however, I encourage cache hunters to show their list of attributes for others to see.
Enjoy and good hunting!