one who direct the course of a ship, or one who is skillful in the art of navigation; also, a book which teaches the art of navigation; as, Bowditch's Navigator
a person who navigates, especially an officer with that responsibility on a ship or an aircrew member with that responsibility on an aircraft
The navigator on an aircraft or ship is the person whose job is to work out the direction in which the aircraft or ship should be travelling. He became an RAF navigator during the war. an officer on a ship or aircraft who plans which way it should go when it is travelling from one place to another