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[[ImagFile:Navit sdl close view.png|thumb|250px|right|[[Navit]] turn-by-turn navigation]]
'''Turn-by-turn navigation''' is a feature of some [[GPS navigation device]]s where directions for a selected route are continually presented to the user in the form of spoken and visual instructions.<ref>{{cite book |title=Handbook of transport systems and traffic control |last=Button |first=Kenneth J. |coauthors=David A. Hensher |year=2001 |publisher=[[Emerald Group Publishing]] |location= |isbn=9780-0-08-043595-4 |page=497 |pages= |url=http://books.google.com/books?id=COMbsJ8QqzYC&pg=PA497&dq=turn-by-turn+navigation&hl=en&ei=FXbTTOrzC4SwuAOAl4TWBA&sa=X&oi=book_result&ct=result&resnum=10&ved=0CFsQ6AEwCTgo#v=onepage&q=turn-by-turn%20navigation&f=false |accessdate=}}</ref> The system keeps the user up-to-date about the best route to the destination, and is often updated according to changing factors such as traffic and road conditions.<ref>{{cite book |title=Global information infrastructure: the birth, vision, and architecture |last=Targowski |first=Andrzej |authorlink= |year=1998 |publisher=[[IGI Global]] |location= |isbn=9781-1-878289-32-2 |page=264 |pages= |url=http://books.google.com.au/books?id=HyvMYDWj9ocC&pg=PA264&dq=turn-by-turn+navigation&hl=en&ei=wXXTTIPfPIuWvAOEqpz4BA&sa=X&oi=book_result&ct=result&resnum=9&ved=0CFAQ6AEwCDge#v=onepage&q=turn-by-turn%20navigation&f=false |accessdate=}}</ref> Turn-by-turn systems typically use an electronic voice to inform the user whether to turn left or right, the street name, and how much distance to the turn.
<ref>{{cite book |title=Human computer interaction |last=Jacko |first=Julie A. |year=2009 |publisher=[[Springer Science+Business Media]] |location= |isbn=978-3-642-02579-2 |page=141 |pages= |url=http://books.google.com.au/books?id=Rz6NJA5ZatsC&pg=PA141&dq=turn-by-turn+navigation&hl=en&ei=OnTTTLXeIIXsuAP_u7GKBQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CD8Q6AEwAw#v=onepage&q=turn-by-turn%20navigation&f=false |accessdate=}}</ref>

[[ImagFile:TomTomOne.jpg|thumb|250px|right|A TomTom device]]

==Devices and services==

Major mapping services that offer turn-by-turn navigation, grouped by map data provider <ref name="comp" />:
*[[Ovi Maps]].<ref name="OReilly_1">{{cite web |url=http://radar.oreilly.com/2009/10/google-shrinks-another-market.html |title=Google Shrinks Another Market With Free Turn-By-Turn Navigation |author=Brady Forrest |date=14 October 2009 |publisher=[[O'Reilly Media]] |accessdate=4 November 2010}}</ref> Devices that use [[Navteq]] map data <ref name="comp">See [[comparison of web map services]]</ref>:
**[[Garmin]] car navigators<ref name="OReilly_1"/>
**[[Nokia]] smartphones running either [[Symbian]], [[Maemo]], or [[Windows Phone 7]] (Ovi Maps software is included as standard)
*[[Google Maps]] and [[Yahoo! Maps]].<ref name="OReilly_1"/> Devices that use [[Tele Atlas]] map data <ref name="comp" />:
**[[TomTom]] car navigators<ref name="OReilly_1"/>
**[[Android (operating system)|Android]] smartphones on-line through [[Google Maps]] (included as standard)<ref name="OReilly_1"/>
**[[Apple iPhone]] on-line through [[Google Maps]]{{factCitation needed|date=December 2011}}
*Other:
**Android smartphones off-line using the free [[MapDroyd]] with maps from [[OpenStreetMap]], [[Navteq]] or [[Tele Atlas]]<ref>{{cite web |url=http://www.mapdroyd.com/|title=MapDroyd |accessdate=2011-03-16}}</ref>
**Apple iPhone on-line or offline using various commercial [[software]]<ref>{{cite web |url=http://www.navigadget.com/index.php/2009/06/29/iphone-gps-apps |title=iPhone GPS apps |date=29 June 2009 |publisher=Navigadget |accessdate=7 November 2010}}</ref>

==References==
{{reflist}}

[[Category:GPS]]
[[Category:Navigation]]
[[Category:Wireless locating]]
[[Category:Satellite navigation systems]]


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