| 摘要 |
PURPOSE: A navigation device with a function for warning a dozer while driving is provided to induce a driver a safe drive by outputting a warning message. CONSTITUTION: A navigation device(100) includes a map data database(110), a message data database(140), a GPS receiver(120), a temperature sensor(130), a navigation controller(150), an audio processing unit(160), and a display device(180). The message data database stores message data. Message data is the warning messages. The GPS receiver receives position data and time information. The temperature sensor senses the indoor temperature of the vehicles. The navigation controller calculates the degree of danger in doze off while driving. The navigation controller outputs map matching data. An audio processing part outputs an audio signal corresponding to the warning message. The display device shows a map screen.
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