| http://www.w3.org/ns/prov#value | - The operation of the vehicle position detecting unit 34 is carried out in accordance with the known map matching method which is so called in those skilled in the art, and the operation of the vehicle position detecting unit 34 is repeated at a predetermined time interval such as for example 1.2 seconds to have the navigation control unit 40 operated to update the data of the current position P2
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