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Navigation system and method for providing departure times

  • US 9,557,187 B2
  • Filed: 04/20/2015
  • Issued: 01/31/2017
  • Est. Priority Date: 10/22/2008
  • Status: Active Grant
First Claim
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1. A navigation system, comprising:

  • a processing resource; and

    an output device for providing a departure time to a user,wherein the processing resource is configured to;

    receive user schedule data from at least one user device, and to obtain destination data representative of a destination and a desired arrival time from the user schedule data;

    determine a plurality of possible routes to the destination and an expected travel time to the destination for each of the plurality of routes in dependence upon historic travel data, wherein said historic travel data comprises measured average speed data at different times;

    select a route from the plurality of possible routes to the destination, the selected route having the shortest determined expected travel time to the destination;

    determine a departure time in dependence upon the expected travel time to the destination using the selected route such that the user arrives at the destination by the desired arrival time;

    recalculate the expected travel time for each of the plurality of routes in dependence upon current travel data when the determined departure time is within a predetermined threshold of the current time, wherein the current travel data is indicative of current travel conditions;

    reselect a route from the plurality of possible routes to the destination, the selected route having the shortest recalculated expected travel time to the destination;

    update the departure time in dependence upon the recalculated expected travel time to the destination using the reselected route; and

    provide the updated departure time to the user on the output device, the providing comprising adding or subtracting one or more offset times to or from the departure time resulting in a corresponding number of departure or pre-departure times and providing, to the user, corresponding messages or signals as a current time matches each departure time or pre-departure time.

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