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Turn-by-turn Navigation is a feature of some
satellite navigation device A satellite navigation device (satnav device) is a user equipment that uses one or more of several global navigation satellite systems (GNSS) to calculate the device's geographical position and provide navigational advice. Depending on the s ...
s where directions for a selected route are continually presented to the user in the form of spoken or visual instructions. 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. Turn-by-turn systems typically use an electronic voice to inform the user whether to turn left or right, the street name, and the distance to the next turn. Mathematically, turn by turn navigation is based on the
shortest path problem In graph theory, the shortest path problem is the problem of finding a path between two vertices (or nodes) in a graph such that the sum of the weights of its constituent edges is minimized. The problem of finding the shortest path between t ...
within
graph theory In mathematics, graph theory is the study of '' graphs'', which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of '' vertices'' (also called ''nodes'' or ''points'') which are conn ...
, which examines how to identify the path that best meets some criteria (shortest, cheapest, fastest, etc.) between two points in a large network.


History

Real-time turn-by-turn navigation instructions by computer was first developed at the MIT Media Laboratory by James Raymond Davis and Christopher M. Schmandt in 1988. Their system, Backseat Driver, monitored the car's position using a system developed by NEC that communicated over a cellular modem with software running on a
Symbolics LISP Machine Symbolics was a computer manufacturer Symbolics, Inc., and a privately held company that acquired the assets of the former company and continues to sell and maintain the Open Genera Lisp system and the Macsyma computer algebra system.
at the Media Lab. The computer then used a speech synthesizer to compute appropriate directions and spoke them to the driver using a second cellular phone.


Devices and services

Major mapping services that offer turn-by-turn navigation, grouped by map data provider:See comparison of web map services *
HERE Technologies Here Technologies (stylised and trading as HERE and here) is an American-Dutch multinational group dealing with mapping, location data and related automotive services to individuals and companies. It is majority-owned by a consortium (an a ...
: ** HERE WeGo, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
,
Fire OS Fire OS is a mobile operating system based on the Android Open Source Project, it is developed by Amazon for their devices. Fire OS includes proprietary software, a customized user interface primarily centered on content consumption, and heavy ...
and iOS **
Garmin Garmin Ltd. (shortened to Garmin, stylized as GARMIN, and formerly known as ProNav) is an American, Swiss-domiciled multinational technology company founded in 1989 by Gary Burrell and Min Kao in Lenexa, Kansas, United States, with headquarte ...
, road portable navigation devices, car built-in navigation devices ** Genius Maps, a paid online and offline turn-by-turn navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
,
HarmonyOS HarmonyOS (HMOS) () is a distributed operating system developed by Huawei to collaborate and interconnect with multiple smart devices on the Internet of Things (IoT) ecosystem. In its current multi-kernel design, the operating system selects ...
and iOS *
Google Google LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...
: **
Google Maps Google Maps is a web mapping platform and consumer application offered by Google. It offers satellite imagery, aerial photography, street maps, 360° interactive panorama, interactive panoramic views of streets (Google Street View, Street View ...
, a free online navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
, iOS and
KaiOS KaiOS is a mobile Linux distribution for keypad feature phones based on the Firefox OS open-source project. It is developed by KaiOS Technologies (Hong Kong) Limited; a company based in Hong Kong, whose largest shareholder is Chinese multin ...
* TomTom: ** TomTom car, motorcycle and truck portable navigation devices, car and truck built-in navigation devices,
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
and iOS smartphones and tablets online and offline through AmiGO **
Apple Maps Apple Maps is a web mapping service developed by Apple Inc. The default map system of iOS, iPadOS, macOS, and watchOS, it provides directions and estimated times of arrival for driving, walking, cycling, and public transportation navigation ...
, a free online navigation app for iPhone and
ipad The iPad is a brand of iOS and iPadOS-based tablet computers that are developed by Apple Inc. The iPad was conceived before the related iPhone but the iPhone was developed and released first. Speculation about the development, operati ...
using iOS 6 or later ** Petal Maps, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
7 or later,
HarmonyOS HarmonyOS (HMOS) () is a distributed operating system developed by Huawei to collaborate and interconnect with multiple smart devices on the Internet of Things (IoT) ecosystem. In its current multi-kernel design, the operating system selects ...
and iOS ** Windows Maps, a free online and offline navigation app for
Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for ...
*
OpenStreetMap OpenStreetMap (OSM) is a free, open geographic database updated and maintained by a community of volunteers via open collaboration. Contributors collect data from surveys, trace from aerial imagery and also import from other freely licensed ...
. Offline-capable applications that use volunteer-contributed data: ** Karta GPS, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
and iOS ** Locus Map, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
** Magic Earth, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
,
Fire OS Fire OS is a mobile operating system based on the Android Open Source Project, it is developed by Amazon for their devices. Fire OS includes proprietary software, a customized user interface primarily centered on content consumption, and heavy ...
and iOS **
MAPS.ME Maps.me (styled as MAPS.ME) is a mobile app for Android, iOS and BlackBerry that provides offline maps using OpenStreetMap data. It was formerly known as MapsWithMe. In November 2014, it was acquired by Mail.Ru Group and became part of its My. ...
, a free offline and open-source app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
and iOS ** Mapy.cz, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
, iOS and
Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for ...
** OsmAnd, a free online and offline navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
,
Fire OS Fire OS is a mobile operating system based on the Android Open Source Project, it is developed by Amazon for their devices. Fire OS includes proprietary software, a customized user interface primarily centered on content consumption, and heavy ...
and iOS **Scout GPS Link for Android and iOS *Other: **smartphones and tablets with iOS 5 or earlier using various commercial
software Software is a set of computer programs and associated software documentation, documentation and data (computing), data. This is in contrast to Computer hardware, hardware, from which the system is built and which actually performs the work. ...
** Sygic GPS Navigation, a paid offline turn-by-turn navigation app for
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
and iOS (map data based on Here, TomTom, OpenStreetMap and Sygic Maps) ** Waze, a free app providing turn-by-turn navigation on
Android Android may refer to: Science and technology * Android (robot), a humanoid robot or synthetic organism designed to imitate a human * Android (operating system), Google's mobile operating system ** Bugdroid, a Google mascot sometimes referred to ...
, iOS and
Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for ...


References

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