On-board navigation system for motor vehicles
US4891760A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1988 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Sep 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B29/106
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An on-board navigation system for motor vehicles comprises a first storage medium in which map data in digital form is stored, a control device for gathering map data of a region having a given area including a present location of the vehicle from a first storage medium, and to display a map on a display screen on the basis of the gathered map data, and a second storage medium of non-volatile type into and from which data is written and read-out. The control device is operative to memorize, at the time of the turn-off of a power supply of the vehicle, data gathered immediately before a fall of the power in the second storage medium, and to display the map at the time of a rise-up of the power supply on the basis of the data memorized in the second storage medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.