Patent ID: 6526284
Filing Date: 2003-02-25
Classification: G01C,G08G

Abstract:
A method of distribution of geographic information to mobile devices via a wireless communications network, the method including:generating a plurality of data elements comprising containing the geographic information, each data element relating to and including an identifier of a specific single segment of a segmented map, wherein the plurality of data elements comprise a first set of data elements providing low level of detail (LLoD) geographic information and one or more additional sets of data elements providing high level of detail (HLoD) geographic information; and broadcasting the data elements via the wireless communications network for receipt by the mobile devices, wherein the first set of data elements is broadcast via a first transmission channel and the additional sets of data elements are broadcast via one or more transmission channels separate from the first; and wherein broadcast of each of the LLoD data elements is repeated more frequently than broadcast of each of the HLoD data elements.