Communication-type navigation apparatus and server device
US6889134B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 30, 2002 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Aug 30, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A communication type navigation apparatus can communicate with a server device via a communication path. The navigation apparatus requests route search, and the server device executes route search to produce route information of a searched route. Then, the meshes necessary to travel along the searched route are determined, and the navigation apparatus obtains necessary mesh data from the server device. The navigation apparatus may request newer mesh data to the server device based on the updating information of the mesh data. By appropriately determining the mesh data to be and not to be downloaded from the server device, the communication cost necessary for obtaining the mesh data can be saved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.