A.reverse port engine, apply right rudder B.reverse port engine,rudder amidships C.reverse starboard engine, apply right rudder D.revers starboard engine, rudder amidships
A.in a straight line B.to port C.from side to side D.to starboard
A.aid turing the ship B.obtain a fine bearing C.increase ship swing to wind or tide D.lighten the stress of anchor chains