Patent ID: 6029069
Filing Date: 2000-02-22
Classification: G01C,G08G

Abstract:
A navigation system using a portable phone comprising:a portable phone for transmitting destination information for a destination building, a navigation request for navigation to said destination building and present location information on a present location of a user of said portable phone;a base station for controlling a call of said portable phone in its control area;a building database file for storing information of each name and location of buildings existing in said control area;a map database file for storing a map covering said control area and a map covering a periphery of said control area based on a building location;a question message database file for storing question messages which demand said portable phone user to input a response according to a predetermined format to determine a present location of said portable phone user;route search means for retrieving information for said destination building from said building database file based on a navigation request and destination information received through said base station, and searching said map database file for a navigation route starting from a present location to a destination based on present location information received through said base station and said retrieved destination building information, and for searching said question message database file for a question message used to determine the present location of said portable phone user; andmeans for transmitting said question message and said navigation route to said portable phone through said base station.