| 摘要 |
A method and apparatus for a navigation system efficiently stores the data associated with a calculated route to the destination in a backup memory by incorporating a direction coding method. The method and apparatus can be advantageously implemented in such a situation where the operation of the navigation system is terminated during the route guidance operation before reaching the destination. Since each direction code requires a small amount of data bit, an overall amount of data for the calculated route can be dramatically reduced and can be stored in a small memory space. When the navigation system is restarted, the calculated route will be reproduced based on the direction codes retrieved from the backup memory, thereby enabling to continue the route guidance operation to guide the user the destination.
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