Current position information management systems, methods, and programs

摘要

Systems, methods, and programs for current position information management store map data and detect a current position of a vehicle using dead-reckoning navigation. The systems, methods, and programs monitor, based on the detected current position, a left-right position of the vehicle relative to a lane in which the vehicle is traveling. The systems, methods, and programs add up an amount of movement in the left-right direction and detect a lane change by comparing the added up amount of movement with the lane's width.