Mobile navigation system
First Claim
1. A method for determining a current time zone for a mobile navigation system having a GPS receiver, the method comprising:
- storing a digital representation of three sets of time zone division lines, ranging in accuracy from course to medium to fine, each of said three sets being represented by a number of polygons, wherein said number of polygons in each of said three sets is different in complexity from course to medium to fine;
obtaining a position from the GPS; and
comparing said position with said three sets of time zone division lines successively from course to medium to fine to determine how many of said three sets of time zone division lines said position is falling onto, wherein the current time zone is determined from a finer one of said three sets of time zone division lines that said position is falling onto.
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Accused Products
Abstract
A client navigation system establishes a wireless connection to a navigation server on a computer network. The client requests a route by uploading start and stop specifications. The server calculates an optimal route based on real-time data available on the network. A generic natural language description is used to specify the optimal route downloaded to the client. The natural language description is independent from the local mapping database software on the client and includes a plain text description for each link using pre-defined generic terms. The client interprets the route, interfaces with the local mapping database and reconstructs the optimal route using a mapping reconstruction algorithm. The route is displayed on the client navigation system using whatever mapping database is present. An enhanced user-interface data-entry feature is provided that anticipates data being entered by users to minimize the data-entry process. The current time zone is derived from the current GPS position and is used to set the clock on the navigation system in the client. Maps are automatically scrolled on a display screen so that a representation of the automobile is always pointing to the right or to the left to allow for additional look-ahead space on certain display systems. A telephone coupled with the navigation system automatically displays the current local time for a called party upon dialing out. The dialed number is used to query a local database for providing local time information.
19 Citations
11 Claims
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1. A method for determining a current time zone for a mobile navigation system having a GPS receiver, the method comprising:
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storing a digital representation of three sets of time zone division lines, ranging in accuracy from course to medium to fine, each of said three sets being represented by a number of polygons, wherein said number of polygons in each of said three sets is different in complexity from course to medium to fine; obtaining a position from the GPS; and comparing said position with said three sets of time zone division lines successively from course to medium to fine to determine how many of said three sets of time zone division lines said position is falling onto, wherein the current time zone is determined from a finer one of said three sets of time zone division lines that said position is falling onto. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a current time zone for a mobile navigation system having a GPS receiver, the method comprising:
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storing a digital representation of multiple sets of time zone division lines of different resolutions, each of said sets being represented by a number of polygons, wherein said number of polygons in each of said sets is different in complexity from course to medium to fine; obtaining a position from the GPS; and comparing said position with said digital representation to determine if said position is between said multiple sets of time zone division lines of different resolutions for determining the current time zone. - View Dependent Claims (8)
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9. A method for determining a current time zone for a mobile navigation system having a GPS receiver, the method comprising:
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storing a digital representation of multiple sets of time zone division lines of different resolutions for a time zone interface, the multiple sets of time zone division lines stored as corresponding multiple sets of polygons; obtaining a position from the GPS; and comparing said position with said digital representation to determine if the position is within the sets of polygons corresponding to the multiple sets of time zone division lines of different resolutions for a time zone interface for determining the current time zone. - View Dependent Claims (10, 11)
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Specification