Patent ID: 6810325
Filing Date: 2004-10-26
Classification: G08G

Abstract:
A position locating system comprising:a client apparatus for detecting current position of the client apparatus and transmitting obtained position information at a predetermined frequency; an information terminal for transmitting an instruction for searching for the current position of the client apparatus; and a server for receiving the current position search instruction from the information terminal and transmitting map image data containing the current position of the client apparatus to the information terminal based on the position information transmitted from the client apparatus, wherein the server includes a position estimation section for estimating the current position of the client apparatus based on the already acquired position information when the server cannot acquire the position information from the client apparatus and the server requests the client apparatus to transmit position information in response to the search instruction from the information terminal, wherein the server further includes a database, which stores geographic data indicating a reception failure position where there is a possibility that reception of the position information from the client apparatus may stop dead; and wherein the position estimation section estimates the current position of the client apparatus based on the geographic data.