| 摘要 |
<p>A navigation system performing navigation based on a detected current position and map data is provided. The navigation system includes a storage device (15), a navigation control device (11), and a defragmenting processing device (11). The storage device (15) such as a hard disk is nonvolatile. Files of map data are able to be read from it, and to be written into it. The navigation control device (11) controls a navigation operation using the map data. Then, the defragmenting processing device (11) performs a defragmenting processing with the storage device (15) at a predetermined time.
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