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In a navigation system arranged to display a road map in accordance with road map information from a cassette tape, and the present location of a motor vehicle equipped with the navigation system, a cassette tape distinguishing circuit is provided to a cassette tape player which picks up the road ma

In a navigation system arranged to display a road map in accordance with road map information from a cassette tape, and the present location of a motor vehicle equipped with the navigation system, a cassette tape distinguishing circuit is provided to a cassette tape player which picks up the road map information from a predetermined cassette having a window at given portion of the cassette housing. A switching circuit is responsive to the cassette tape distinguishing circuit so that the output data of the cassette tape is processed to display a given map only when a cassette carrying road map information is loaded in the cassette tape player. In the case a normal cassette carrying audio signals, such as music, is loaded the picked up audio signal is transmitted to an amplifier so that sound reproduction is effected. Thus, a single cassette player can be used in common as both a part of the navigation system and a part of a sound reproduction system.

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A navigation system for use with an automobile, comprising: (a) a direction detector for producing an output signal indicative of the travelling direction of said autombile; (b) a distance sensor for producing a signal each time said automobile travels a predetermined unit distance; (c) a reading un

A navigation system for use with an automobile, comprising: (a) a direction detector for producing an output signal indicative of the travelling direction of said autombile; (b) a distance sensor for producing a signal each time said automobile travels a predetermined unit distance; (c) a reading unit for deriving either road map information or audio information from a detachable recording medium, said reading unit including first means for driving said recording medium, a second means for detecting whether the contents of said recording medium is road map data or audio information so as to distinguish recording medium carrying said road map data from other recording medium carrying audio information; and fifth third means for outputting, via a first output terminal, road map data read out from said recording medium only when said recording medium has been determined by said second means as carrying said road map data, and for outputting, via a second output terminal, audio information read out from said recording medium only when said recording medium has been determined by said second means as carrying said audio information; (d) a microcomputer, responsive to the road map information from said first output terminal of said third means for producing first output data, and to the output signals from said direction detector and said distance sensor for producing second output data; (e) a display controller, responsive to said first and second output data, for producing a video signal; and (f) a display unit responsive to said video signal for displaying said road map data as well as the present location of the automobile.