초록 ▼

A navigation apparatus reduces route search time while providing guidance in conformity with drivers' preferences, by selectively conducting either a full-range route search or a more limited, local area search, in accordance with detected conditions and responsive to occurrence of an off-route even

A navigation apparatus reduces route search time while providing guidance in conformity with drivers' preferences, by selectively conducting either a full-range route search or a more limited, local area search, in accordance with detected conditions and responsive to occurrence of an off-route event. For example, the full-range route search is conducted pursuant to a determination that the vehicle has gone straight at a predetermined number of certain intersections where current guidance has directed a turn.

대표청구항 ▼

[ What is claimed:] [1.] A vehicle navigation apparatus for providing guidance comprising:search means for searching to predetermine a route to a destination from a starting location or a present position;off-route recognition means for recognizing deviations of the vehicle from current guidance;sel

[ What is claimed:] [1.] A vehicle navigation apparatus for providing guidance comprising:search means for searching to predetermine a route to a destination from a starting location or a present position;off-route recognition means for recognizing deviations of the vehicle from current guidance;selecting means for selecting between a re-search, in a first mode, of road data limited to a limited area closely surrounding a detected present position of the vehicle to determine a return route for return to the predetermined route and, responsive to a predetermined plural number of said deviations, a re-search in a second mode of second road data covering a wide area greater than said limited area, said wide area extending from the detected present position to the destination, to determine a new route from the detected present position to the destination;re-search means for conducting a re-search in the mode selected by said selection means; andguidance means for outputting guidance in accordance with the predetermined route, the return route and the new route.