The present invention relates to a method for identifying a candidate part of a map to be updated. The method comprises receiving position data relating to a plurality of reroute points and determining one or more clusters of reroute points based on the po...

The present invention provides, in a car navigation system, a unit of notifying a user of the update contents of map data prior to the downloading of the map data. A vehicle-mounted terminal (2) sets a difference update area in accordance with a selection ...

A method of collecting data for a geographic database for use with a navigation system is disclosed. An image of a geographic area is obtained. A plurality of geographic features visible in the image are identified. For each of the identified geographic fe...

At least one element subset of the digital map can be preset to be updated by transmitting data from a central office. The central office automatically selects an additional element subset in a second digital map so that after update, the digital map is co...

A process and system for collecting data about roads located in a geographic area and using the collected data to develop representations of the roads for a geographic database. Data representing positions along roads are acquired using equipment installed...