| 摘要 |
PROBLEM TO BE SOLVED: To automatically correct clock time and to display correct time continually by converting the time of a world clock in GPS data being received from a car navigation device to local time and using the local time. SOLUTION: GPS data 5a received from a GPS antenna 5 are inputted to a car navigation device 4 and a position signal is obtained. At the same time, world clock time in the GPS data 5a is inputted to a local time conversion device 3 via communication means 4a such as RS-232, is converted to Japan local time 3a, and is inputted to a clock 2. When the local time 3a is inputted to the clock 2, digital or analog time display is automatically corrected by a time correction circuit. When the clock 2 is to have a ROM 2a, the local time 3a is inputted to the ROM 2a, and the data in the ROM 2a are corrected every moment, thus automatically correcting the time display of the clock 2. |
