| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a navigation system capable of presenting an alternate route, issuing alarming or the like even under a situation where external information cannot be obtained. <P>SOLUTION: The navigation system includes a vehicle information acquisition part 17 acquiring a signal concerning a road situation as vehicle information from a vehicle information sensor 1b equipped in a vehicle; a road information storage part 3b storing in order road information of the vehicle information obtained by the vehicle information acquisition part added with date and time information; a current position detection section 11 detecting a current position; a destination setting part 12 setting a destination; a route search part 13 searching a route from the current position detected by the current position detection section to the destination set by the destination setting part; a route information computing part 19 computing the situation of the road forming the route searched by the route search part based on the road information stored in the road information storage part; and output parts 20, 21 outputting information to call a travel attention depending on the road situation computed by the route information computing part. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
