EGP (Experimental Geodetic Satellite) was launched by a two-stage H-I launch vehicle from the Tanegashima Space Center of the National Space Development Agency of Japan. The national name of the satellite was Ajisai. Its mission was to improve the accuracy of the Geodetic Triangulation Network, to accurately determine the locations of remote islands, and to know the relationship between the Japanese Geodetic System Network and those of other parts of the world.