Navigation system, vehicle navigation apparatus, and method for obtaining navigation information
US7406381B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 2005 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Nov 22, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3415
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation system, a vehicle navigation apparatus therein, and a method for obtaining navigation information using the same are provided which can obtain navigation information quickly when a vehicle goes off-route by obtaining the navigation information required for route guidance of the vehicle through communications, thereby achieving reduction in communication time and cost. In a vehicle-mounted terminal connected in communication with a server for executing route guidance to provide a guidance route from the present position of the vehicle to a destination, when the vehicle reaches a point located at a predetermined distance before a fork representing the next turn on the guidance route, the server is accessed to set a communication means in a communication connection stand-by state. If the vehicle deviates from the guidance route, information needed for the vehicle to return to the guidance route is requested from the server. After the vehicle passes through the fork along the guidance route, the communication connection stand-by state is released.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.