Route guidance system, information delivery center, and...

Details Route guidance system, information delivery center, and... Route guidance system, information delivery center, and...

2005-06-07

2005-06-07

Black, Thomas G. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

C701S206000, C701S208000, C701S209000, C701S210000, C701S211000, C340S995100, C340S995120, C340S995180, C340S995190, C340S995200, C340S995210, C340S996000

Reexamination Certificate

active

06904362

ABSTRACT:
An information center generates packets of route guidance information, each corresponding to a prescribed road length of a recommended route. The information center may generate major guide point information and guidance information and transmit both to a vehicular apparatus. The vehicular apparatus provides guidance only for major guide points based on the received major guide point information if it cannot receive the guidance information. According to another aspect of the invention, if the end of a route segment which was the subject of the preceding route guidance information is on an expressway or toll road, guidance information for a preliminary route from that end to an escape position ahead on the expressway or toll road is first transmitted and then information for a remaining route, that is a segment of the recommended route having the prescribed road length minus the preliminary route, is then transmitted. If communication with the information center is lost, the vehicular apparatus performs guidance for the preliminary route to an interchange, for example, of the expressway using the preliminary route guidance information.

REFERENCES:
patent: 6484093 (2002-11-01), Ito et al.
patent: 6526284 (2003-02-01), Sharp et al.
patent: 6594580 (2003-07-01), Tada et al.
patent: 10-019588 (1998-01-01), None
patent: 2001-147132 (2001-05-01), None

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