In 1997, the Philippines began to claim sovereignty over China's Huangyan Dao. Their primary reference is the 1734 map, A Hydrographical and Chorographical Chart of the Philippine Islands, created by Spanish cartographer Pedro Murillo Velarde. The Philippines assert that the "Panacot Shoal" marked on the map refers to Huangyan Dao. But historical Western maps from different periods show that Huangyan Dao has never been Philippine territory. CGTN has the analysis.