a person who navigates.
a person who practices, or is skilled in, navigation, as of ships or aircraft.
a person who conducts explorations by sea.
British. a navvy.

1580–90; < Latin nāvigātor a sailor, mariner. See navigate, -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
navigator (ˈnævɪˌɡeɪtə)
1.  a person who is skilled in or performs navigation, esp on a ship or aircraft
2.  (esp formerly) a person who explores by ship
3.  an instrument or device for assisting a pilot to navigate an aircraft

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590, "one who navigates," from L. navigator "sailor," from navigatus (see navigation). Meaning "laborer employed in excavating a canal" is 1775, from sense in inland navigation "communication by canals and rivers" (1727).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Navigator definition

Netscape Navigator

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Discuss the exits with your navigator, go around again if necessary, and then
  confidently wing off on the exit of your choice.
Each boat's navigator sat alone, undisturbed by the crew and without other
  tasks to perform, absorbing the signals all around.
Uncharismatic and unable to charm a crowd, he is instead an expert navigator of
  the corridors of power.
She learnt to fly and became his co-pilot and navigator.
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