| 摘要 |
According to a navigation device in accordance with the present invention, only when there is a difference having a predetermined magnitude between a first traffic variable measured by a first processor and a second traffic variable based on traffic information distributed from a navigation server, the first traffic variable is transmitted to the navigation server as traffic information. This prevents new traffic information from being transmitted to the navigation server from the navigation device mounted in a vehicle or a probe car when the new traffic information is not worth updating of the traffic information stored in the navigation server, thus restraining a waste of traffic information transmission cost.
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