Westwardho's 'Walk The Plank' Mystery Cache

When Westwardho! first started on his romantic adventures sailing the Northern seas it wasn't long before the Pope put a price on his head after a nasty run in with a ship full of nuns,what the fool was going to do with a hold full of wooden crosses though was beyond me.

Another run in followed with a Priestess. Where, after stealing her sacrificial jewelled orb, she placed a curse on him causing him to feel nauseous at the smell of rum (a curse that still exists to this day). His fine fighting ship 'The Chariot' was a good speedy vessel and not many people outwitted him.  After his run in with the Priestess you would think he would be more careful,  but no,  he was made to look a complete fool by a magician who disappeared in a puff of smoke and made his escape in a rowing boat. But Westwardho! trawled the seas for him and in cruel fashion when he found him, he left him marooned on a desert island to live out his days eating coconuts and seeing how long he could grow his beard.

Sailing Westwards to warmer climes the fool then came across a ship with an Empress on board. The Empress was incredibly wealthy and plunder was bountiful. A celebration was in order but rum was still a 'no no' after the Priestess had placed the curse.  A pang of guilt hit him at this point and he wondered that while she was very wealthy,  she was also very beautiful and if they became lovers would it make him change his wicked ways.? Ultimately it was his destiny to keep sailing 'The Chariot' and to pacify his crew of sea dogs and any of them who thought otherwise could always go and keep the magician company.

Westwardho! has again hidden some of his treasure and yet again he is sick of the sight of all you scurvy ridden landlubbers trying to steal it. It has taken years of sailing the high seas, raping, plundering, pillaging, losing limbs and eating weevil infested ship's biscuits to accumalate such wealth and he's not ready to give it up so easily.

The final location is tidal (I have spent my whole life by the sea after all), you will need specialist equipment, and you undertake at your own risk. Update...Extra hint added as I want people to work it out....you still have the problem of getting to it.