| 摘要 |
Navigation device (200) and methods of operating navigation devices (200) are disclosed. A navigation device (200) includes a processor (210) to calculate a planned route between a current location of the navigation device and a desired destination. The processor (210) is configured to calculate an alternate route based on a response time, when the navigation device (200) diverges from the planned route at a junction, such that an estimated travel time to an initial deviation included in the alternate route is at least equal to the response time. The navigation device further includes a receiver (250) operably coupled to the processor (210) and to receive at least one spread spectrum signal such that the processor (210) in conjunction with the receiver (250) operates to determine the current location of the navigation device (200) and to monitor travel along the planned route and a display device (240) operably coupled to the processor (210) to display the alternate route. A method includes monitoring travel of a navigation device (200) along a planned route to a desired destination, calculating an alternate route to the desired destination based on a response time, when the navigation device (200) diverges from the planned route at a junction, such that an estimated travel time to an initial deviation included in the alternate route is at least equal to the response time, and displaying the alternate route via a display device (240).
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