where does the captain sit on a ship
Bridge (nautical) The bridge of a ship is the room or platform from which the ship can be commanded. When a ship is underway the bridge is manned by an OOW (officer of the watch) aided usually by an AB (able seaman) acting as lookout. During critical maneuvers the captain will be on the bridge supported, perhaps, by an OOW as an extra set of hands, an AB on the wheel and sometimes a pilot if required.
Ensign (rank) In the United States Navy, the rank of ensign superseded passed midshipman in 1862. Ensign is the junior commissioned officer rank in the United States Navy, the United States Coast Guard, the National Oceanic and Atmospheric Administration Commissioned Officer Corps, and the PHS Commissioned Corps. This rank is also used in the U.S. Maritime Service and the U.S. Naval Sea Cadet Corps. Ensign ranks below lieutenant junior grade, and it is equivalent to a second lieutenant in the U.S. Army, the Marine Corps, and the Air Force.