Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Aisin Aw Co., Ltd.

Tetsuo Kumagai

Kazunori Watanabe

Tomoki Kodan

Kenji Nagase

Xin Jin

Takayuki Watanabe

Hiroyoshi Masuda

Yasutaka Atarashi

Tominori Iwata

Atsushi Tanabe

Hikaru Nagasaka

Yusuke Kawabata

Location data is obtained in which an arrival link from which a vehicle can enter a location serving as a destination and an arrival link direction are associated with the location, the arrival link direction indicating a direction in which the vehicle can enter upon entering the location from the arrival link. A cost related to the arrival link is corrected based on the obtained location data. A route to the destination is searched for, using the corrected cost related to the arrival link.

Route searching device and computer program

When an update instruction to update 'A' navigation map information and 'B' navigation map information is inputted, a CPU initializes the storage area having stored therein no map information currently in use out of the two storage areas. The CPU then reads, from a CD-ROM, the latest version of the &#x201c;A&#x201d; navigation map information or the &#x201c;B&#x201d; navigation map information that corresponds to the map information currently in use, and stores it in the initialized storage area. The CPU then updates management information, starts use of the newly stored map information, initializes the storage area having stored therein the map information whose use is stopped out of the two storage areas, reads, from the CD-ROM, the latest version of the &#x201c;A&#x201d; navigation map information or the &#x201c;B&#x201d; navigation map information not currently in use, and stores it in the initialized storage area.

Navigation apparatus and map information updating method

A method for switching a reference map data in a navigation device having a map data memory for storing a plurality of map data, the navigation device executing a navigation function with using a first map data among the plurality of map data stored in the map data memory as the reference map data, the method includes: reading out a second map data from a memory medium; determining whether the map data memory already stores a same map data as the second map data; and switching the reference map data from the first map data to the same map data as the second map data when the map data memory already stores the same map data as the second map data in the memory medium.

Method for switching reference map data in navigation device, computer readable medium for the same, and navigation device

Growing community of inventors

Okazaki, Japan

Tetsuo Kumagai