Patent ID: 7555386

Claim:
A system for sharing position information using a mobile communication system, the system comprising: the mobile communication system providing a short message service (SMS); at least one second navigation terminal for periodically receiving a predetermined position information short message using the short message service (SMS), detecting the position information from the received position information short message, mapping the detected position information to map data, displaying the mapped position information, and transmitting a position information short message comprising self-position information in response to the received position information short message; and a first navigation terminal for, in a position information sharing mode, receiving and storing a proper number of each second navigation terminal, transmitting a position information short message comprising self-position information to the navigation terminals having the proper numbers through the mobile communication system, receiving the position information short message from the navigation terminal in response to the position information short message, mapping a position based on the position information comprised in the received position information short message to the map data, and displaying the mapped position, wherein the second navigation terminal transmits a position information sharing permission or denial short message representing a position information sharing permission or denial to the first navigation terminal, and the first navigation terminal analyzes the position information sharing permission or denial short message and, only when it is analyzed to be the position information sharing permission, communicates the position information short message and shares the position information directly with the second navigation terminals.