The Sanguine Sailor is the ship owned and captained by Captain Opa Hardsea, it’s a large sailing ship, somewhere between the size of a normal sailing ship and a warship. The ship has the ability to take up to 30 crewmen, and in exchange for sacrificing some of the ability to carry cargo, it can carry up to 20 passengers.
The ship is broken down into four different levels, the highest having the Forecastle and the Quarterdeck, then there's the Main Deck. Directly below the main deck is the Lower Deck, and right below there is the Cargo Hold.