GPS (Global Positioning System) is a navigation system using the circumference satellite NAVSTAR managed by the U. S. Department of Defense, and can acquire the present position. The interface and the protocol between a commercial GPS receiver and a personal computer (PC) were examined. In the interface between a GPS receiver and a PC, two interfaces, (1) USB connection and the Internet connectivity which used (2) POP3 protocol, were considered. Based on the examination, the positioning data acquisition application, which operates with a windows PC, was created. In this research, the connection conditions for a GPS receiver and PC and the protocol were clarified. Moreover, the basic data for constituting movable positioning equipment and remote positioning equipment was obtained.