Abstract: A system and method are disclosed for providing geographic data to end users' mobile units from a remotely located navigation services provider so that navigation functions can be provided locally on the mobile units. The navigation services provider determines one or more map tile exit points along the route and sends the tile exit points and a set of map tiles to the mobile unit. The mobile unit calculates a route from its current position to the farthest map tile exit point for which map tile data has been received from the navigations services provider.

Abstract: A system and method are disclosed for providing geographic data to end users' mobile units from a remotely located navigation services provider so that navigation functions can be provided locally on the mobile units. While a user is operating a mobile unit to specify a destination for which route information is desired, an initial set of geographic data is downloaded from the remotely located navigation services provider. The initial set of geographic data represents an area located around a current position of the mobile unit when specification of the destination is initiated. Once the destination has been specified, data indicating the destination is used by the remotely located navigation services provider to calculate a route to the destination.

Abstract: A system and method are disclosed for providing geographic data to mobile units from a remotely located navigation-services provider. When a mobile unit requests route information, the navigation-services provider transmits an initial set of geographic data representing an area around a current position of the mobile unit. The navigation-services provider calculates a route to the destination and then identifies an intermediate exit point along the route that is located within the initial set of data. The mobile unit calculates an initial portion of the route to the intermediate exit point. The navigation-services provider determines a list of geographic-data groups needed to represent the remainder of the route and transmits this list to the mobile unit. Each geographic-data group is transmitted to the mobile unit along with an intermediate exit point. Using the received data, the mobile unit provides route guidance to a local end user.