Patent ID: 6567744
Filing Date: 2003-05-20
Classification: G01C

Abstract:
An in-vehicle navigation apparatus, comprising:current positional information generating means for detecting a current location of a vehicle and generating current positional information; map information storage means for storing map information including road information; display map information generating means for reading a predetermined area of map information from said map information storage means on the basis of said current positional information and generating display map information from the map information thus read; display means for displaying said display map information and said current positional information; travel route planning means for planning a travel route of said vehicle on the basis of said road information; and vehicle speed detecting means for detecting a speed at which said vehicle travels, wherein said display map information generating means changes a size of an extending area which extends along said travel route in accordance with said vehicle speed and extracts map information corresponding to said extending area from said map information read from said map information storage means, thereby providing said display map information; wherein said extending area is a rectangular area extending along said travel route and said display map information generating means changes an area width of said rectangular area in accordance with said vehicle speed and extracts map information on said rectangular area from said map information read from said map information storage means, thereby providing said display map information.