This cache is not at the posted coordinates!
The posted coordinates are at the same location as the adventure lab, Little Bay Bridge.
(The Adventure Lab series name is "Voyage in Time and Space - Clovelly to Little Bay")
After completing the adventure lab, a keyword for the certitude checker will be supplied and may be found in the journal.
The keyword is essential in solving this mystery cache.
You can validate your puzzle solution with certitude.
After solving the puzzle provided in the certitude checker, the standard cache checker may be used to confirm the cache's GZ.
The cache may be found at S 33° 58.ABC' E 151° 13.XYZ'
Congratulations to ye seafarers, EverestHigh and Brewmaker, for navigating the briney deep with compasses which don’t point north, finally earning a smiley and credit for FTF, as bounty, for ye wit on the waves.