The Maritime Safety Administration of the People's Republic of China (CMSA; Chinese: 中华人民共和国海事局) is a government agency which administers all matters related to maritime and shipping safety, including the supervision of maritime traffic safety and security, prevention of pollution from ships, inspection of ships and offshore facilities, navigational safety measures (including Search and Rescue, Aids to Navigation and the GMDSS), administrative management of port operations, and law enforcement on matters of maritime safety law. It was also responsible for marine accident investigation. It is headquartered in Dongcheng District, Beijing.