Patent ID: 8489322

Claim:
A course guidance system, comprising: a controller that: acquires vehicle location information indicating a current location of a vehicle; acquires road information including information on a road link and information on an exit/entrance node, the road link indicating an out-of-facility road, the exit/entrance node indicating a location of an exit/entrance of a facility having an exit lane connected to the out-of-facility road at the exit/entrance node; determines that the vehicle is exiting from the facility to the out-of-facility road; determines an estimated connection angle of the exit lane at the exit/entrance node; generates course guidance information based on the determined estimated connection angle when the vehicle is determined to be exiting, the course guidance information being guidance on a traveling direction to a guidance road, the guidance road forming part of a guidance route on which the vehicle will travel after exiting from the exit lane; based on the vehicle location information and the road information, detects whether an actual traveling road and the guidance road differ, the actual traveling road being a road on which the vehicle will travel after exiting from the exit lane; when the actual traveling road and the guidance road differ, based on the vehicle location information and the road information, corrects the estimated connection angle at the exit/entrance node based on a relative angle between the actual traveling road and the guidance road; and records the corrected estimated connection angle.