Vehicle-mounted navigation apparatus

Claim 1

A navigation apparatus mounted on a vehicle for indicating a current position of the vehicle on a screen of a display unit disposed therein, said navigation apparatus comprising: a travel distance sensor for detecting distance traveled by the vehicle; an azimuth sensor for detecting a running direction of the vehicle; receiving means for externally receiving information concerning location of the vehicle, said receiving means including an antenna and a receiver; position detecting means for detecting a current position of the vehicle from data collected from said travel distance sensor, said azimuth sensor, and said receiving means; map data storage means for storing data corresponding to a plurality of road maps, each road map having a different scale; scale indication pattern storage means for storing a plurality of scale indication patterns showing respective reduced scales corresponding to the stored road maps; scale indication switching means for selecting one of said scale indication patterns stored in said scale indication pattern storage means; a touch panel unit for generating a control signal for specifying an image to be displayed on the screen; and a display control unit which reads said data from said map data storage means corresponding to one of said road maps in accordance with the current position of the vehicle detected by said position detecting unit, controls the read data to be displayed on the screen of the display unit in accordance with said control signal from said touch panel unit, and further reads the selected scale indication pattern from said indication pattern storage means in accordance with the selection operation of said scale indication switching means, thereby superimposing the selected scale indication pattern on the displayed road map.

Claim 7

A method for indicating a current position of a vehicle on a screen of a display unit disposed therein, said method comprising the steps of: (a) detecting distance traveled by the vehicle; (b) detecting a running direction of the vehicle; (c) externally receiving information concerning location of the vehicle through an antenna and a receiver; (d) detecting a current position of the vehicle from data collected in said steps (a), (b), and (c); (e) storing data corresponding to a plurality of road maps, each road map having a different scale; (f) storing a plurality of scale indication patterns showing respective reduced scales corresponding to the stored road maps; (g) selecting one of the stored scale indication patterns; (h) generating a control signal for specifying an image to be displayed on the screen; (i) reading the data corresponding to one of the stored road maps in accordance with the current position of the vehicle; (j) displaying on a screen of the display unit the one road map in accordance with the control signal generated in said step (h); (k) reading the selected stored scale indication pattern in accordance with the selection operation of said step (g), thereby superimposing the selected scale indication pattern on the displayed road map.

Claim 8

A method for indicating a current position of a vehicle on a screen of a display unit disposed therein, said method comprising the steps of: (a) detecting distance traveled by the vehicle; (b) detecting a running direction of the vehicle; (c) externally receiving information concerning location of the vehicle through an antenna and a receiver; (d) detecting a current position of the vehicle from data collected in said steps (a), (b), and (c); (e) storing data corresponding to a plurality of road maps, each road map having a different scale; (f) storing a plurality of scale indication patterns showing respective reduced scales corresponding to the stored road maps; (g) selecting one of the stored scale indication patterns; (h) generating a control signal for specifying an image to be displayed on the screen; (i) reading the data corresponding to one of the stored road maps in accordance with the current position of the vehicle; (j) displaying on a screen of the display unit the one road map in accordance with the control signal generated in said step (h); (k) reading the selected stored scale indication pattern in accordance with the selection operation of said step (g), thereby superimposing the selected scale indication pattern on the displayed road map.