초록 ▼

In an on-board navigation system for motor vehicles, having a memory device in which map data in digital form is stored, and adapted to read-out from the memory device map data of a region of a given area including a present location of the vehicle while recognizing the present location of the vehic

In an on-board navigation system for motor vehicles, having a memory device in which map data in digital form is stored, and adapted to read-out from the memory device map data of a region of a given area including a present location of the vehicle while recognizing the present location of the vehicle and to display a map on a display screen on the basis of the map data, a switching device for selectively supplying an electric power to the memory device is provided. The switching device is controlled to supply the electric power to the memory device only when the map data is read-out from the memory device. A power switch for selectively supplying the power current to a display unit is also provided, thereby further reduction of the electric power consumption is possible.

대표청구항 ▼

An on-board navigation system for a motor vehicle, having a memory device in which map data in digital form is stored, adapted to read-out from the memory device map data of a region of a given area including a present location of the vehicle while recognizing the present location of the vehicle and

An on-board navigation system for a motor vehicle, having a memory device in which map data in digital form is stored, adapted to read-out from the memory device map data of a region of a given area including a present location of the vehicle while recognizing the present location of the vehicle and to display a map by a display unit on the basis of the map data, said system comprising: switching means for selectively supplying electric power to the memory device; and control means for operating said switching means to supply the electric power to the memory device, said control means performing the operations of detecting whether or not map data around the present position of the vehicle has been stored into the memory device, and operating said switching means to supply the electric power to the memory device if it is detected that the map data around the present position of the vehicle has not been stored into the memory device.