A vehicle-mounted map acquisition apparatus 1 obtains maps A-D of different scales from a information center 30. Map A with a small scale covering a wide area is obtained at a starting point distant from a destination and is used to provide route guidance. As a vehicle approaches the destination, it...http://www.google.es/patents/US6061003?utm_source=gb-gplus-sharePatente US6061003 - Map acquisition system, map acquisition unit, and navigation apparatus equipped with a map acquisition unit
Map acquisition system, map acquisition unit, and navigation apparatus ...
