A ship lost at sea with a loyal captain in the golden age of pirates with a supernatural twist as the ship is brought into the eye of the storm 

Monsters like the kraken and such are real

A big factor in survival being able to find loot, steal, and threaten ships 

Rival ships may attack especially if the ship encroaches on another English Cargo Ship leavin’ port

Everyone talks like pirates except for those who are merchants/nobles/landlubbers