Aisin Aw Co., Ltd.

Yasuki Hosoi

Atsushi Mochizuki

Shogo Sugimoto

Tominori Iwata

Syougo Matsuhisa

Shougo Matsuhisa

According to navigation systems and methods, when a detected current position has deviated from a guidance route, a navigation device transmits a reroute calculation condition to an information distribution center including the current position and the destination. Based on the reroute calculation condition, the information distribution center determines whether a distance from the current position to a closest adjacent link is equal to or shorter than a predetermined distance. When the distance from the current position to the closest adjacent link is longer than the predetermined distance, the information distribution center distributes to the navigation device reroute prohibition information including information regarding the adjacent link and a maximum waiting time. The maximum waiting time is a time that must elapse before the navigation device can again transmit the reroute calculation condition.

Navigation system and navigation method

Navigation devices, methods, and programs store map data hierarchically with the map data of a hierarchy level being excluded. The devices, methods, and programs read the stored map data, perform a route search within each predetermined area on a departure point side and a destination side, and acquire a shortest cost route in a range overlapped in search areas. In a hierarchy level having a proximal higher hierarchy level of which the map data does not exist, the devices, methods, and programs expand the predetermined area into a search area in the proximal higher hierarchy level and acquire a first shortest cost route, and perform the route search in a higher hierarchy level to acquire a second shortest cost route. When the second shortest cost route's cost is smaller than the first shortest cost route's cost, the devices, methods, and programs update the cost of the shortest cost route.

Growing community of inventors

Okazaki, Japan

Yasuki Hosoi