This cache can help with several challenges. Rhyme Time Challenge, California Multi Cache Challenge, and maybe more.
This is a simple two stage multi. GZ should take you to a "T" intersection where you will see a white sign with a phone number on it in black (ending with 00). Add all the digits of the phone number together to get X. Multiply X by 10 to get Z. Add Z to 299 to get N, subtract Z from 594 to get W.
Final is at N38 02.N and W122 14.W.
Check sum all digits = 52