| 摘要 |
<p>A vehicle navigation device comprises sensors (300) which output pulse signals corresponding to the traveling distances of a vehicle, a vehicle display device (100) which displays, based on the pulse signals vehicle information data including the traveling distance, and a navigation unit (200) which receives the distance data related to the traveling distances obtained by processing the pulse signals outputted from the vehicle display device (100) or the pulse signals at a certain reception period to calculate the present position of the vehicle, and controls the vehicle display device (100) to display road traffic information data including the display synthesized with the present position on a map in accordance with map data read from a map information memory medium (230). If the navigation unit (200) can not receive the distance data or the pulse signals within the reception period, the estimated values to be received this time are estimated from the difference between a value inputted last time and a value inputted last time but one and the navigation unit (200) calculates the present position in accordance with the estimated values.</p> |
