Navigation system with licensing function
US7260475B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 2005 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Nov 18, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
When a navigation system is started for the first time, a time/position information item unique to each navigation system is generated based on a position and time detected for the first time by a GPS receiver of a position detector. This generated time/position information item is stored both in a hard disk of a map data storage device and in an internal memory. When a starting process performed at starting of the system, it is determined whether time/position information items stored in the hard disk and the internal memory accord with each other. When both information items are determined to be according with each other, map data stored in the hard disk is given a license for use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.