This cache is NOT at the posted location. Do NOT even attempt to go to the posted location.
To get the final location of this cache, look at the satellite view of GZ.
For the latitude, add the numbers on each end of the runway that predominantly goes SW to NE to 429.
For the longitude, subtract the numbers on each end of either runway that predominantly goes N to S from 502.
Final is at: N 29° 37.xxx' W 95° 8.xxx'