In a navigation system, a current position is designated as a center of a start-point area. A semiconductor device comprises a plurality of interconnect layers, and an interconnect in at least one interconnect layer among the plurality of interconnect layers contains an impurity, and the wider the interconnect in the at least one interconnect layer is, the higher concentration of the impurity the interconnect contains. Methods of making and using the compositions are also provided. The driven shaft is mounted rotatably in the casing, rotates in response to the motor and has a mount.