Toyota Jidosha Kabushiki Kaisha

Aisin Aw Co., Ltd.

Isao Moribe

Hironobu Sugimoto

Tomoki Kodan

Norihiro Nakamura

Toru Sakai

Hiroyoshi Masuda

Yoriyuki Nagata

A map updating system that stores map data and a priority sequence table, acquires first update data and second update data of the map data according to the priority sequence table, and updates the map data based on the first update data and second update data according to the priority sequence table.

Map updating system

A CPU of a navigation apparatus stores public keys to which priorities are set and which are published by an information distribution center in a public key storage section. The CPU of the navigation apparatus extracts an electronic signature of distribution data which is distributed from the information distribution center and verifies the electronic signature by using only 'valid' public keys among the public keys in order of the priorities. The CPU of the navigation apparatus determines that the distribution data is valid information which is distributed from the information distribution center when the electronic signature passes verification.

Navigation apparatus and information distribution system

When updating meansfor performing a differential update on map data M using update data U performs an update on the map data M using update data U stored on a recording medium R, update data U having section identification information that matches the section identification information of the map data M and a later update version than the update version of the map data M are extracted from the plurality of update data U stored on the recording medium R, and a differential update is performed on the map data M using the extracted update data U.

Navigation device and map data updating method thereof

Growing community of inventors

Okazaki, Japan

Isao Moribe