| 摘要 |
<p>A map distribution center creates an instruction data that is in a format unified among pieces of map structuring data that structure a map data and transmits the created instruction data to a navigation apparatus. The navigation apparatus rewrites, in units of bytes, a data portion of a navigation map data that has been identified by the transmitted instruction data so that the data portion has new contents of data, and the navigation map data is thus updated to a new version of map data.
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