So you want to write about adventure on the high seas? Warships or pirate ships adventurously prowling the oceans! Well then, you need to first know about ships.
Let us start with nomenclature. Sailors had to have a language that enabled them to describe the parts of their ships and the locations of the part with extreme precision. If an order was given, it had to be immediately clear what a sailor was to do, even if the sailor could not see the man who issued the order.
Abeam: Off to the side of the ship, at right angles to the direction the ship is pointed
Ahead: In front of the ship, in the direction the ship is pointed.
Apparent Wind: The true wind blows in some direction. However, the speed of a fast boat can make it seem that the apparent wind comes from a direction determined by the speed and direction of the wind and the speed and direction of the ship. Apparent wind is only a factor in a very fast sailing ship.
Astern: Behind the ship, in the opposite direction from which the ship is pointed
Aloft: Above the deck of the ship.
Batten Down: Secure hatches and loose objects both within the hull and on the deck.
Beam: The greatest width of a ship.
Bearing: The direction of an object expressed either as a true bearing as shown on a chart, or as a bearing relative to the heading of the boat. A navigator might use a chart bearing, a sailor would probably use a ship heading bearing.
Below: Beneath the deck.
Bilge: The interior of a hull below the floorboards.
Block: A wooden or metal case enclosing one or more pulleys and having a hook, eye, or strap by which it may be attached. See Tackle.
Bow: The forward part of a boat.
Bowsprit: A spar extending forward from the bow.
Broach: Sudden, unplanned, and uncontrolled turning of a vessel so that the hull is broadside to the seas or to the wind.
Bulkhead: A vertical partition separating compartments. On land it would be a wall.
Dead Ahead: Directly ahead.
Dead Astern: Directly astern.
Dead Reckoning: A plot of courses steered and distances traveled through the water without use of landmarks.
Deck : A permanent covering over a compartment, hull or any part of a ship serving as a floor.
Draft: The depth of water a ship requires to sail.
Flotsam: Wreckage or cargo that remains afloat after a ship has sunk. Floating refuse or debris.
Following Sea: An overtaking sea that comes from astern.
Forecastle: Also spelled Fo'c'sle (pronounced Folksul) fo'c's'le originally meant the upper deck of a sailing ship, forward of the foremast. The forward part of a sailing ship with the sailors' living quarters is also called forecastle.
Fouled : Any piece of equipment that is jammed or entangled, or dirtied.