| 摘要 |
In a navigation system by which vehicle travel locations are detected by an angular rate sensor and a distance sensor and the detected vehicle travel locations are corrected so as to be displayed along a map road, when a detected vehicle travel angle exceeds a predetermined value under the condition that the vehicle is out of a route judge area set at each branch point, an abnormal travel is detected and alarmed while displaying an abnormal vehicle location. Further, when a travel route change cannot be determined after the vehicle has passed through the set route judge area, an abnormal location is also displayed and alarmed.
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