Communication navigation system
US6542816B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Nov 17, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3896
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A communication navigation system, wherein a navigation apparatus requests a recommended route guidance data to a information center and guides a user of the navigation apparatus to a destination by using the recommended route guidance data received from the information center.In this present invention, the navigation apparatus transmits version data of road data held in the navigation apparatus at the request to the information center. The information center prepares a guidance data of recommended route using latest road data held in the information center, and transmits the data to the navigation apparatus. When the information center transmits the guidance data, the information center selects the type of data of the road links along the recommended route, in the guidance data, by comparing the version data received from the navigation apparatus and the version data of each road link along the recommended route. If each data of road links along the recommended route is considered to be contained in the road data held in the navigation apparatus, the information center transmits the only data which enable to specify the road link from the road data held in the navigation apparatus…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.