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Automotive navigation system
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====Media==== The road database may be stored in [[Read-only memory|solid state read-only memory (ROM)]], optical media ([[CD]] or [[DVD]]), solid state [[flash memory]], magnetic media ([[hard disk]]), or a combination. A common scheme is to have a base map permanently stored in ROM that can be augmented with detailed information for a region the user is interested in. A ROM is always programmed at the factory; the other media may be preprogrammed, [[download]]ed from a [[CD]] or [[DVD]] via a [[computer]] or network connection, or directly using a [[card reader]]. Some navigation device makers provide free map updates for their customers. These updates are often obtained from the vendor's website, which is accessed by connecting the navigation device to a PC.
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