the act or process of navigating.
the art or science of plotting, ascertaining, or directing the course of a ship, aircraft, or guided missile.

1520–30; < Latin nāvigātiōn- (stem of nāvigātiō) a voyage. See navigate, -ion

navigational, adjective
misnavigation, noun
nonnavigation, noun
renavigation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
navigation (ˌnævɪˈɡeɪʃən)
1.  the skill or process of plotting a route and directing a ship, aircraft, etc, along it
2.  the act or practice of navigating: dredging made navigation of the river possible
3.  rare (US) ship traffic; shipping
4.  dialect (Midland English) an inland waterway; canal

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

1530s, from L. navigationem (nom. navigatio), from navigatus, pp. of navigare "to sail, sail over, go by sea, steer a ship," from navis "ship" (see naval) + root of agere "to drive" (see act).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Be sure to take along a high-quality map that includes navigational markers to
  tell you where you are.
Discovering the crocodiles' brilliant navigational skills is bad news because
  it means that relocation is not working.
More sober minds suggested the box was a clock or a navigational device, but
  even those interpretations rested on skimpy evidence.
Perhaps she was taken off course by some navigational error.
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