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This paper describes the Electro-Multivision map navigation software mounted in the Toyota Soarer (1991). The following functions are required of on-board map navigation software: 1. Indication of the exact position of the vehicle to the driver 2. Determination of the optimum path to the destination and presentation of this route to the driver in the simplest way 3. Accommodation of a wide variety of destinations and settings for different users The following gives some examples of how these functions are achieved and outlines the associated technologies. 1. Path finding and associated display technology Path finding algorithm and technology for displaying the calculated on the map; construction of a data base on CD-ROM 2. Technology for determination of the current position utilizing map matching and the global positioning system(GPS) A method with improved reliability based on two current position outputs obtained using map matching and the GPS and the mutual compensation method 3.

This paper describes the technical issues regarding the Digital Map Compact Disc (CD), called CD Information, which has been released in conjunction with the Electro Multivision system in the 1987 model Toyota Crown. This CD contains data files of road maps, highway guides and Toyota dealer informations for all of Japan. First, we introduce the hierarchy of road maps as they relate to Electro Multivision functions, eg, such as how to call up and display a map, in addition to the vehicle direction and positioning illustration. Secondly, we discuss our considerations for this CD map development program, including indexing maps, grid maps, dividing files, compressed drawing data, characterizing data and recognizing redundancy. Finally, we present in detail the format and contents of the CD map.