Patent ID: 9291464
Filing Date: 2016-03-22
CPC Classification: G01C,G06F,G09B

Claim Text:
1. A navigation apparatus comprising: a map storage unit that stores specific road map data hierarchically describing a road network in a particular region in accordance with a plurality of road ranks including a highest road rank and a non-highest road rank that is other than the highest road rank, a temporary memory that is accessible at a higher speed than the map storage unit, the temporary memory being used to temporarily store area data read from the map storage unit; and a control portion having a processor and including wherein: the read control section reads from the temporary memory area data that is included in the area data requested by the read request and is stored in the temporary memory, whereas the read control section reads from the map storage unit area data that is included in the area data requested by the read request and is not stored in the temporary memory; the read control section collectively reads a subject area data on basis of one or more groups when reading from the map storage unit the area data that is included in the area data requested by the read request and is not stored in the temporary memory, the read control section temporarily stores in the temporary memory the subject area data read from the map storage unit; and the read requester further configured to run at least one of based on the area data in the temporary memory stored by the read control section in compliance with the generated read request.