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An automotive navigation system is part of the automobile controls or a third party add-on used to find direction in an automobile. It typically uses a satellite navigation device to get its position data which is then correlated to a position on a road. When directions are needed routing can be calculated. On the fly traffic information can be used to adjust the route. Dead reckoning using distance data from sensors attached to the drivetrain, a gyroscope and an accelerometer can be used for greater reliability, as GPS signal loss and/or multipath can occur due to urban canyons or tunnels. ==History== Automotive navigation systems represent a convergence of a number of diverse technologies many of which have been available for many years, but were too costly or inaccessible. Limitations such as batteries, display, and processing power had to be overcome before the product became commercially viable.〔''Cartographies of Travel and Navigation'', James R. Akerman, (p.277 )〕 Etak made an early system that used map-matching to improve on dead reckoning instrumentation. Digital map information was stored on standard cassette tapes.〔("Positioning and Navigation )〕 *1980: Electronic Auto Compass with new mechanism on the Toyota Crown. *1981: navigation computer on the Toyota Celica. *1987: Toyota introduced the World's first CD-ROM-based navigation system on the Toyota Crown. *1990: Mazda Eunos Cosmo became the first car with built-in GPS-navigation system *1991: Toyota introduced GPS car navigation on the Toyota Soarer. *1992: Voice assisted GPS navigation system on the Toyota Celsior. *1995: Oldsmobile introduced the first GPS navigation system available in a United States production car, called GuideStar. *1995: Device called "Mobile Assistant" or short, MASS, produced by Munich-based company ComRoad AG, won the title "Best Product in Mobile Computing" on CeBit by magazine Byte. It offered turn-by-turn navigation via wireless internet connection, with both GPS and speed sensor in the car. *1995: Renault Safrane introduce first European CD based navigation system (CARMINAT Philips - Renault), big color display modern interface and 2D map view. *1995: BMW 7 series E38 second European model with the Sat Nav, using pretty same software and hardware (Philips - Renault) like Renault Safrane, build in magnetometer, more features available from the menu like: AUX ventilation, TV or Phone *1997: Navigation system using Differential GPS developed as a factory-installed option on the Toyota Prius *1998: First DVD-based navigation system introduced on the Toyota Progres *2000: The United States made a more accurate GPS signal available for civilian use. *2003: Toyota introduced the first Hard disk drive-based navigation system and the industry's first DVD-based navigation system with a built-in Electronic throttle control *2007: Toyota introduced Map on Demand, a technology for distributing map updates to car navigation systems, developed as the first of its kind in the world *2008: World's first navigation system-linked brake assist function and Navigation system linked to Adaptive Variable Suspension System (NAVI/AI-AVS) on Toyota Crown 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Automotive navigation system」の詳細全文を読む スポンサード リンク
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