1
Haruhisa Tamai: Navigation system for a vehicle with route recalculation between multiple locations. Zexel Corporation, Morrison Law Firm, March 4, 1997: US05608635 (161 worldwide citation)

A vehicle navigation system guides a driver along an optimal route from a starting point to a destination, either of which can be specified in categorical terms. That is, the starting point need not be on a road, and the categorical destination can be entered as "nearest gas station" or "closest har ...


2
Haruhisa Tamai: Route generation in a vehicle navigation system. Visteon Technologies, Beyer & Weaver, August 17, 1999: US05938720 (127 worldwide citation)

Methods and apparatus for generation of a route from a source location to a final destination are described. According to one embodiment, a two-ended search is performed based on the principles of the A* algorithm. That is, two routes are simultaneously generated, one from the source to the destinat ...


3
Jeff Jyh Min Liaw, Simon Peter Desai, Haruhisa Tamai: Incremental route calculation. Zexel Corporation, Joseph M Hickman Beyer & Weaver Villeneuve, January 27, 1998: US05712788 (93 worldwide citation)

Method and apparatus for determining a route from a source location to a final destination using a vehicle navigation system having a map database. At least one intermediate destination is determined from the map database, each intermediate destination being at the other end of an intermediate route ...


4
Haruhisa Tamai, Tatsuhiko Abe: Navigation system. Zexel Corporation, Thomas R Morrison, March 1, 1994: US05291412 (87 worldwide citation)

A vehicle navigation system computes an optimal route from stored map data. Where the vehicle deviates from the optimal route, either by mistake or by choice, the driver can command computation of a new optimal route. The driver may choose whether or not to permit U-turns on the new route, thereby i ...


5
Haruhisa Tamai: Vehicle navigation system. Zexel Corporation, Pollock Vande Sande & Priddy, May 10, 1994: US05311434 (81 worldwide citation)

In a vehicle navigation system having memory for storing road map information, calculating unit for calculating the optimum route from a given initial location to the destination and display device for sequentially displaying the directions in which the vehicle operator should drive to follow the ro ...


6
Takao Fujii, Toshihiro Hamahata, Haruhisa Tamai: Navigation system displaying forthcoming turns. Zexel USA Corporation, Morrison Law Firm, August 5, 1997: US05654892 (80 worldwide citation)

A vehicle navigation system displays arrow icons to a driver indicating the directions he must follow from each of one or more turning points on his route to keep the driver from passing inadvertently an intersection in which he must change the vehicle's direction of advance or from turning in an in ...


7
Haruhisa Tamai, Tatsuhiko Abe: Navigation system for guiding a vehicle along a precomputed optimal route. Zexel Corporation Daihatsu Nissan Ikebukuro, Thomas R Morrison, March 1, 1994: US05291413 (75 worldwide citation)

A navigation system prevents a vehicle from deviating from a new optimal route immediately after the new optimal route has been computed following the first deviation of the vehicle from an original optimal route. The system does this by determining the present location of the vehicle and searching ...


8
Hidekazu Oshizawa, Haruhisa Tamai: Method and apparatus for determining an alternate route in a vehicle navigation system. Visteon Technologies, Beyer & Weaver, July 27, 1999: US05928307 (73 worldwide citation)

A method and apparatus for determining an alternate route from a new source location located on an original route to a subsequent location on the original route using a vehicle navigation system are described. A portion of the original route to be avoided by the alternate route is determined which b ...


9
Simon Desai, Haruhisa Tamai: Method for identifying highway access ramps for route calculation in a vehicle navigation system. Zexel Corporation, Townsend and Townsend and Crew, May 7, 1996: US05515283 (67 worldwide citation)

A method for identifying highway access ramps in a database medium for use as locations for route calculation. Initially, first road segments which belong to a highway and which are connected to at least one access ramp are identified. The first road segments are sorted according to the highway to w ...


10
Haruhisa Tamai, Tatsuhiko Abe: Navigation system with off-route detection and route recalculation. Zexel Corporation, Thomas R Morrison, November 16, 1993: US05262775 (67 worldwide citation)

Where a vehicle deviates from a calculated optimal route, the system displays a message indicating the vehicle's deviation. The driver of the vehicle commands computation of a new optimum route. The system selects a new starting point from a point substantially ahead of the vehicle, recomputes the o ...