According to the official website of Guangzhou International Travel Health Inspection Center, they provide red and yellow books for seafarers. Seafarers' red and yellow books refer to seafarers' health certificates and seafarers' professional qualification certificates, which are necessary documents for seafarers to work abroad. Guangzhou International Travel Health Inspection Center is one of the institutions authorized by China Maritime Safety Administration to handle seafarers' red and yellow books, and they have the qualification and authority to handle seafarers' red and yellow books. Therefore, seafarers' red and yellow could have been handled at Guangzhou International Travel Health Inspection Center.