The method involves forming territorial sections, regions or areas starting from the equator (30) with which essentially equally sized north-south dimensions are associated and with which at least approximately equal east-south dimensions are associated. E...

A certain amount of basic map data is installed into the map data storage medium in the navigation apparatus at the time of initial setting or the like, and thereafter the user connect to the map data providing center to download necessary data according t...

A method and system for organizing and storing map data that facilitates use of the map data by navigation application programs such as those in navigation systems. The map data represent geographic features located in a region. The map data are organized ...

A method whereby a computing platform that uses geographic data that are spatially organized into parcels of a given size can specify a parcel block size larger than the given size. Thereafter, during runtime, the geographic data are accessed by the comput...

A navigation system is provided with: a present position detecting device (16, 17) for detecting a present position; a first memory device (14) for reading map data from a record medium (1) in which the map data is recorded; a second memory device (15) of ...