A pinnace is a light boat, propelled by sails or oars, formerly used as a "tender" for guiding merchant and war vessels. In modern parlance, pinnace has come to mean a boat associated with some kind of larger vessel, that doesn't fit under the launch or lifeboat definitions. In general, the pinnace had sails, and would be used to ferry messages between ships of the line, visit harbors ahead of the fleet with messages of state, pick up mail, etc. A boat is a craft or vessel designed to float on, and provide transport over, water. ... A sail is any type of surface intended to generate thrust by being placed in a wind —in essence a vertically-oriented wing. ... OAR is a three-letter abbreviation with multiple meanings, as described below: An abbreviation of the term Original Aspect Ratio. ... A lifeboat is a rigid (or inflatable) boat designed to rescue people in trouble at sea. ... Ships of the line were 1st, 2nd, or 3rd-rated ships in the rating system of the Royal Navy. ... A harbor or harbour (see spelling differences), or haven, is a place where ships may shelter from the weather or are stored. ... A British pillar box. ...