Navigational information indicator for supplying a vehicle driver with make-turn instructions
US4242731A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | Jan 24, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2025/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A navigational information indicator for supplying a vehicle driver with make-turn instructions comprises a first memory for storing each information indicative of each distance travelled by the vehicle as far as a point at which a turn is made, a second memory for storing each information indicative of the direction of each turn, and a display circuit for displaying a directional sign. When the vehicle travels from a first point toward a second point, the distances and directions of turns are respectively stored in the first and second memories in a sequence and these pieces of information are read out in the reverse sequence when the vehicle travels back to the first point from the second point along the same route. The stored information is read out to display each directional sign so as to supply the vehicle driver with make-turn instructions along the return trip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.