Patent ID: 6023652
Filing Date: 2000-02-08
Classification: G01C

Abstract:
A navigation apparatus in a vehicle comprising:a system controller including a CPU, a memory, a recording medium for storing digitized map information, an interface, a graphics controller, a display control circuit and a data bus connecting said CPU, memory, recording medium, interface, graphics controller and the display control circuit to one another;a running distance sensor for detecting a movement distance of the vehicle and outputting movement distance data to the interface;a global positioning system for detecting a present position of the vehicle and outputting present position data to the interface;a display connected to the display control circuit for displaying a map relating the present position of the vehicle;an input device for receiving start position data representing a start position and destination position data representing a destination position and outputting the start position data and the destination position data to the data bus of the system controller;wherein the CPU determines an actual running distance ab from the start position to the present position based upon the start position data from the input device and the movement distance data from the running distance sensor, determines an estimated running distance bc from a detected present position to the destination position based upon detected present position data from the global positioning system and the destination position data received from the input device, calculates a degree of attainment T according to an equation of: T=ab/(ab+bc) and outputs the degree of attainment T to the display control circuit; andthe display control circuit causes the display to display the degree of attainment T.