Abstract: A method and apparatus are provided for creating a navigation data source for use with a navigation system configured for route determination based on associated costs. The navigation data source comprises a cost data set associated with a navigation data set that represents a map of a geographic region and defines at least a plurality of gateways. Each of the gateways of the plurality of gateways may be associated with a position located within the geographic region and associated with a gateway of a further navigation data set representing a map of another geographic region. The cost data set comprises cost data that defines, for at least some of the possible gateway pairs of the plurality of gateways, at least a cost value with each cost value indicating a cost for a route between gateways of a respective gateway pair.

Abstract: A navigation data source, said navigation data source comprising: —a cost data set associated with a navigation data set, said navigation data set representing a map of a geographic region and defining a plurality of gateways, each of said gateways of said plurality of gateways being associated with a position at said geographic region and being associable with a gateway of a further navigation data set representing a map of a further geographic region, —wherein said cost data set comprises cost data, said cost data defining for at least a part of possible gateway pairs of said plurality of gateways at least a cost value each, said cost value indicating a cost for a route between gateways of a respective gateway pair.

Abstract: A geographic database is defined using hierarchical data trees and updated by changing selected portions of a data tree. A device defines a binary large object (BLOB) including map data as a first data tree and an update to the map data as a second data tree. The device computes a difference between the first data tree and the second data tree. The difference may include the data and links that are being updated. The device generates an update script including a sequence of edit operations needed to update the map data. The device may communicate the update script to a navigation device, which is configured to execute the update script to perform the update on a local version of the map data.

Abstract: A geographic database is defined using hierarchical data trees and updated by changing selected portions of a data tree. A device defines a binary large object (BLOB) including map data as a first data tree and an update to the map data as a second data tree. The device computes a difference between the first data tree and the second data tree. The difference may include the data and links that are being updated. The device generates an update script including a sequence of edit operations needed to update the map data. The device may communicate the update script to a navigation device, which is configured to execute the update script to perform the update on a local version of the map data.