| 摘要 |
A user of an HDD navigation device inputs a first authentication key to the HDD navigation device. The HDD navigation device verifies the first authentication key with a second authentication key stored in the memory of the main body of the HDD navigation device. If the first and second authentication keys are identical, the HDD navigation device displays a screen for inputting a utilization period for which a corridor function is expected to be used. The user inputs the utilization period according to the screen. Then, the HDD navigation device gives information related to the utilization period in providing the corridor function.
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