Pre-Loading Waypoint Data
First Claim
Patent Images
1. A method of downloading map data to a portable electronic device, the method comprising:
- determining a route;
identifying waypoints along the route; and
downloading and caching map data for the waypoints along the route.
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Abstract
A method of downloading map data to a portable electronic device entails determining a route, identifying waypoints along the route, and downloading and caching map data for the waypoints along the route. The map data for areas around each of the waypoints (intersections, decision points) are thus preloaded prior to the device arriving at or near each waypoint. This ensures that the device has locally cached all the map data needed to render a navigationally useful map of the area around each waypoint.
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Citations
14 Claims
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1. A method of downloading map data to a portable electronic device, the method comprising:
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determining a route; identifying waypoints along the route; and downloading and caching map data for the waypoints along the route. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A machine readable storage medium comprising instructions in code which, when loaded into memory and executed on a processor of a portable electronic device, is adapted to perform the steps of:
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determining a route; identifying waypoints along the route; and downloading and caching map data for the waypoints along the route. - View Dependent Claims (8)
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9. A portable electronic device comprising:
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a positioning subsystem for determining a current location of the device; a radiofrequency transceiver for requesting map data based on the current location of the device and for receiving the map data for map tiles corresponding to the current location of the device; a display for displaying an onscreen map based on the map data that has been received using the radiofrequency transmitter; and a processor operatively coupled to memory for determining a route, identifying at least one waypoint along the route, and preloading in the memory of the device further map data for a map tile corresponding to at least one waypoint that is geographically beyond the map tile corresponding to the current location of the device. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification