On or above the deck, in plain view, not hiding anything.

A letter from a nation or legal representative authorizing action by a privateer. AKA "Letter of marque".

Toward the stern, relative to some object ("abaft the fore hatch").

Further aft than the beam: a relative bearing of greater than 90 degrees from the bow: "two points abaft the port beam".

An order to leave the vessel immediately, usually in the face of some imminent danger. It is an order issued by the Master or a delegated person in command. It is usually the last resort after all oth [..]

On the beam, a relative bearing at right angles to the centerline of the ship's keel.

On or in a vessel

Special naval pennant flown to indicate absence of commanding officer, admiral, his chief of staff, or officer whose flag is flying (division, squadron, or flotilla commander).

The bearing of an object in relation to north. Either true bearing, using the geographical or true north, or magnetic bearing, using magnetic north.

A portable flight of steps down a ship's side.