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The Dynamic Navigation System is an information-providing type navigation and route guidance system. Fundamentally the system is suited for phased implementation. Some measures, however, must be taken in advance to enhance it to the advanced phase. For these measures, information providing data formats, travel time collection methods and small-delay system architecture have been studied. As a result, the flexible data composition for information provision, the on-board travel time measurement for efficient and accurate data collection and the autonomous communication network concept called ‘HYPO NET’ have been proposed.

Optical data links have been developed for use in multiplex wiring harnesses. The links consist of optical fiber cords, optical connectors, and optical transceiver modules. They can be operated under severe environmental conditions in motor vehicles and, because they have wide dynamic range, sensitivity adjustment is not required. A heat-resistant optical fiber cord made of plastic has been developed to enable use at temperatures up to 80°C. Mass-producible, low cost optical connectors have also been developed. In optical transceiver modules, custom designed hybrid ICs are adopted for size reduction. These optical data links are already in use in the Toyota Century.