The cache is not at the posted coordinates.
Solve the puzzle and do the cache dance.
N 38 48.1AA W 121 20.9BB
AA = What year is the Ford Thunderbird first produced.
If you don't know what that is you should or could not play.
BB = What year did Edgar Allan Poe join the U.S. Army.
If you don't know who he is you should or could not play.
You can validate your puzzle solution with certitude.