| 摘要 |
PROBLEM TO BE SOLVED: To give the necessary alarm at an early period without giving the unnecessary alarm, by giving the alarm when it is judged that a down-hill state of a predetermined travelling route judged from the map information satisfies a specific condition. SOLUTION: A fade CPU 20 reads out an updated present position from a present position information memory 18, and reads out a route guidepath within a specific distance on the basis of the present position, from a route guidepath memory 19. The slope information of the route guidepath is read out from a map information memory 15, the downhill slope amount for a specific distance, is calculated on the basis of the slope information, and whether the downhill slope amount is not less than a specific value or not, is judged. When the downhill slope amount is not less than the specific value, a warning sound is generated from a speaker 17, and the alarming content and the downhill slope situation are displayed on the display 16. Whereby the generation of the brake fade can be informed in advance. |
