Navigation device and map data updating method thereof

Abstract

When updating means 24 for 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.

Description

technical field [0001] The present invention relates to a navigation device which has a map database storing a plurality of map data (divided into predetermined update units) and is configured to be able to use the update data to Differential update (differential update) is performed on each map data. Background technique [0002] It is expected that map data used in navigation devices can accurately express the current conditions of roads, facilities, etc. that change frequently. Thus, in known systems, new map data are distributed via a communication network, and the distributed map data are used to update the map data in the map database of the navigation device. In another known system, when the map data is updated in this way, in order to manage the updating status of the map data on the navigation device side, identification symbols (map numbers) are respectively assigned to a plurality of map data stored in the map database. , and an updated version (version number)...

AI Technical Summary

Problems solved by technology

Thus, it is impossible to properly update each of the plurality of map data in the map database

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