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Navigation System with Downloadable Map Data

  • US 20100106403A1
  • Filed: 12/30/2009
  • Published: 04/29/2010
  • Est. Priority Date: 07/20/2004
  • Status: Active Grant
First Claim
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1. A method of operation for a navigation system that includes a server and a mobile unit located remotely from the server, wherein the navigation system uses geographic data which is organized into groupings based on a plurality of map tiles, wherein each of the map tiles corresponds to a separate one of a plurality of geographic areas into which a geographic region is divided, the method comprising:

  • on the mobile unit, continuing to determine a current position of the mobile unit;

    accepting from a user of the mobile unit a destination;

    transmitting the current position and the destination from the mobile unit to the server;

    receiving from the server a set of map tiles and tile exit points associated with a route calculated by the server using the transmitted current position and destination;

    on the mobile unit, calculating a first route from a new current position to a first tile exit point using the data corresponding to a first map tile from the set of received map tiles; and

    as the mobile unit progresses toward the destination, calculating a subsequent route from a subsequent new current position to a next tile exit point.

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