Patent ID: 6453236
Filing Date: 2002-09-17
Classification: G01C

Abstract:
A position display device comprising:display means for displaying a positional relationship between a movable object which moves and a plurality of waypoints which the movable object is estimated to pass; waypoint storage means for storing waypoint information representing positions of the plurality of waypoints and an order in which the movable object sequentially passes the plurality of waypoints; movable-object-position obtaining means for obtaining position information representing a present position of the movable object; zone specifying means for specifying a zone including at least two waypoints which the movable object is estimated to continuously pass, and for generating zone information representing the specified zone, based on the waypoint information stored in said waypoint storage means; and display controlling means for controlling a waypoint symbol expressing at least two waypoints included in a zone including the present position of the movable object and a present position symbol expressing at least a present position of the movable object to be displayed on a display screen of said display means, based on the zone information which said zone specifying means generates and information representing the present position of the movable object which said movable-object-position obtaining means obtains, wherein the zone information generated by said zone specifying means includes data representing a plurality of dots which are arranged so as to form a matrix showing the zone specified by said zone specifying means, the zone being a zone including two waypoints which the movable object is estimated to continuously pass and being specified as dots showing the two waypoints not to be positioned at the outside limit of the matrix.