A method for acquiring map information, a method of navigation, a method for providing area information, a navigation apparatus and an area information providing apparatus in which a predetermined broadcasting signal transmitted from a transmitting station, which is different at every area, is received...http://www.google.com/patents/US6115667?utm_source=gb-gplus-sharePatent US6115667 - Method for acquiring map information, method of navigation, method of providing area information, navigation apparatus, area information providing apparatus and car
