#ship's_officer__officer  a person authorized to serve in a position of authority on a vessel; "he is the officer in charge of the ship's engines"
  supertype:  #mariner__seaman__tar__jacktar__oldsalt__gob__sea_dog__seadog  a man who serves as a sailor
  subtype:  #sea_captain__seacaptain__master__captain  an officer who is licensed to command a merchant ship
     instance:  #William_Kidd__Kidd__Captain_Kidd
  subtype:  #first_mate__firstmate__mate  the officer below the master on a commercial ship
  subtype:  #privateersman__privateer  an officer or crew member of a privateer
     instance:  #Sir_John_Hawkins__Hawkins__Hawkyns__Sir_John_Hawkyns
  subtype:  #purser  an officer aboard a ship who keeps accounts and attends to the passengers' welfare
  subtype:  #sailing_master__sailingmaster__navigator  the ship's officer in charge of navigation
  subtype:  #steward.ship's_officer  the ship's officer who is in charge of provisions and dining arrangements
  subtype:  #supercargo  an officer on a merchant ship in charge of the cargo and its sale and purchase

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