The Naval Institute's magazine carried the story of a battleship captain who was concerned about rough seas and fog when, quite suddenly, a bright light appeared on the horizon.  The captain immediately had the signalman send the message, "Change course immediately!"  But back came the reply, "It is you who must change course!"  Irritated that a battleship should give way to a lesser vessel, the captain ordered that the message be sent, "I am a battleship!"  And back came the reply, "I am the lighthouse!"  The captain changed course.