Navigation system with figure of merit determination
US6741928B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2001 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Mar 6, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigation system switches to a different operational mode based upon a figure of merit determination of the current position solution by the navigation system relative to the map database. If the vehicle navigation system is guiding a driver along a recommended route, and the figure of merit drops below a first predetermined threshold, the navigation system disables an automatic route recalculation routine. If the figure of merit drops below a second predetermined threshold while the vehicle is in route guidance mode, the navigation system displays a textual display of the turn-by-turn instructions along the recommended route to the destination. If the vehicle navigation system is not in a route guidance mode and the figure of merit drops below a third predetermined threshold, the navigation system displays a map of the area surrounding the last current position solution, without displaying the current position of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.