Patent ID: 7337062

Claim:
A pedestrian navigation device for navigating the route of a pedestrian, comprising: position information reception means for obtaining current position information; position information analysis means for analyzing said current position information received by said position information reception means and calculating a current position ai; map information storage means for storing map information; central processing means for calculating current position display information, based on said current position ai calculated by said position information analysis means, and on said map information stored by said map information storage means; and, display means for displaying said current position display information calculated by said central processing means; and characterized in that said central processing means has pedestrian history information comprising a reference direction α indicating the direction of a past movement route and a reference distance β indicating a prescribed distance, takes the current position at the start of navigation to be reference point a 0 , and, upon receiving the current position ai after a prescribed time from said position information analysis means, calculates the distance La 0 ai between said reference point a 0 and said current position ai, and when β>La0ai (1) corrects said current position ai in the direction of said reference direction α and calculates current position display information, but when β≦La0ai (2) corrects said current position ai in the direction of said reference direction α and calculates current position display information, and in addition takes the corrected position of said current position ai to be the new reference point, and takes the direction from the previous reference point a 0 to the new reference point to be the new reference direction α.