Patent ID: 8315796

Claim:
A navigation device comprising: a map database that holds map data; a location and direction measurement unit that measures a current location and direction of a vehicle; a route calculation unit that, based on map data read from the map database, calculates a route from the current location measured by the location and direction measurement unit to a destination; a camera that captures video images ahead of the vehicle; a video image acquisition unit that acquires the video images ahead of the vehicle that are captured by the camera; a road width acquisition unit that calculates, based on road width included in the map data read from the map database, width of a road segment on which the vehicle is traveling, where the road segment is included in the route calculated by the route calculation unit; a video image composition processing unit that generates, when detecting an intersection to be guided as a point of right-turn or left-turn on the traveling road, a graphical content of an arrow indicating a direction of right-turn or left-turn at said intersection, and superposes the generated graphical content of the arrow onto the video images acquired by the video image acquisition unit, where a tip of the arrow is disposed within a range of the width of the traveling road calculated by the road width acquisition unit; and a display unit that displays the video image composed by the video image composition processing unit.