Importance

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Abstract

A current position calculation system is provided for adequately correcting a distance factor which is used for obtaining a travelled distance by utilizing various information at the time when a vehicle turns left or right. According to an output from a headed direction detecting device, an output from a travelled distance calculating device and road data of a road map, at the time when the vehicle turns left or right from a first road to a second road, there is obtained a distance error amount d which is an error in an output from the travelled distance calculating device with respect to an actual value it should be. The distance error amount d is corrected so as to be reduced. In order to obtain the distance error amount d, a moving path of the vehicle position is estimated without considering whether the position is on or off a road after completing the left or right turn, it is checked whether the estimated moving path of the vehicle position is an overshoot or an undershoot with respect to the second road on the road map, and the amount of the overshoot or the undershoot is obtained as the aforementioned distance error amount d.

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First Claim