Electronic navigation system and method
First Claim
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1. A method for providing improved navigation services to a plurality of mobile units, the method comprising:
- from the mobile unit, transmitting a request for a route between an origin and a destination to a base unit;
on the mobile unit, receiving said route from the base unit;
on the mobile unit, comparing the received route with on-board map information stored on the mobile unit;
if a portion of the route is not covered by the on-board map information, from the mobile unit, transmitting a request for a strip map for a geographic area corresponding to the portion of the route not covered by the on-board map information to said base unit, said strip map includes data representing roads, side roads, intersections and points of interest in said geographic area corresponding to the portion of the route not covered by the on-board map information; and
in said mobile unit, receiving said strip map.
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Abstract
The invention provides a system for providing geographic information. The system includes a mobile unit having a first geographic database and a base unit having a second geographic database that is more up-to-date than the first geographic database. The base unit receives a request from a mobile unit for updated geographic data. The base unit identifies a portion of the second geographic database that corresponds to the request and provides a response to the mobile unit comprising the identified portion of the second geographic database.
63 Citations
14 Claims
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1. A method for providing improved navigation services to a plurality of mobile units, the method comprising:
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from the mobile unit, transmitting a request for a route between an origin and a destination to a base unit; on the mobile unit, receiving said route from the base unit; on the mobile unit, comparing the received route with on-board map information stored on the mobile unit; if a portion of the route is not covered by the on-board map information, from the mobile unit, transmitting a request for a strip map for a geographic area corresponding to the portion of the route not covered by the on-board map information to said base unit, said strip map includes data representing roads, side roads, intersections and points of interest in said geographic area corresponding to the portion of the route not covered by the on-board map information; and in said mobile unit, receiving said strip map. - View Dependent Claims (2, 3, 4, 5)
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6. A system for providing geographic information comprising:
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a mobile unit having a first geographic database containing first map data representing roads, intersections and points of interest in a geographic area; a base unit having a second geographic database containing more up-to-date map data representing roads, intersections and points of interest in the geographic area than said first geographic database, wherein said base unit is located remote from said mobile unit; and a communications link to transmit a request from the mobile unit to the base unit and to transmit a response from the base unit to the mobile unit; wherein said mobile unit transmits a request for a route to a base unit, receives the route from the base unit, compares the route with first map data stored on the mobile unit; if a portion of the route is not covered by the first map data, transmits a request for a map update for a geographic area corresponding to the portion of the route not covered by the first map data to said base unit, said map update includes data representing roads, side roads, intersections and points of interest in said geographic area corresponding to the portion of the route not covered by the first map data. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification