| 摘要 |
The navigation device comprises: an input unit on which a destination of a vehicle is to be inputted; a display unit on which displays a route to the destination of the vehicle; a store unit which stores map data and road data; and a control unit which searches the route based on the map data and the road data, wherein the road data may contain a first driving speed estimated based on a speed limit and a traffic volume of the route, and a second driving speed measured while the vehicle travels the route. |
