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    • 93. 发明专利
    • ON BOARD NAVIGATION DEVICE
    • JPH10170281A
    • 1998-06-26
    • JP34050896
    • 1996-12-05
    • ALPINE ELECTRONICS INC
    • ENDO FUMIHITO
    • G09B29/00G01C21/00G01S19/16G08B29/18G08G1/0969G01S5/14
    • PROBLEM TO BE SOLVED: To provide an on-board navigation device which allows sensing if it is a one removed from battery and permits a memory to store the anti-theft code to be constructed in a single piece structure. SOLUTION: An on-board navigation device of car comprises a GPS receiver 21 which includes a clock 21a to emit a time in compliance with the present time information given from a satellite during the power being supplied from an on-board battery 27 of car and return the time to the initial value when the power supply from the battery 27 is stopped and senses the current position of the car from the present time information and positional information given from the satellite, a CPU 30a to sense if the time of the clock 21a has returned to the initial value, an SRAM 28 to store the preset ID code, and a control part 30 which requests entry of the ID code at sensing that the time has returned, compares the entered ID code with ID code stored in the SRAM 28, and executes an appropriate processing in compliance with the obtained result from comparison.