Wireless coverage data are associated with a geographic database that contains data that represent a road network in a geographic region. The wireless coverage data indicate areas within the geographic region in which navigation-related services or data from a navigation services provider are available...http://www.google.fr/patents/US7305302?utm_source=gb-gplus-shareBrevet US7305302 - Geographic database including data indicating wireless coverage and method and system for use thereof
Geographic database including data indicating wireless coverage and method ...
