What is the district and location of Shanghai Maritime Hospital?

You should be talking about Shanghai Seamen's Hospital (below is the address and introduction).

No.505 Dongzhangzhi Road, Hongkou District, Shanghai

Shanghai Seafarers' Hospital, located at No.505, Zhangzhi Road, East of the North Bund, is the first batch of designated medical units for medical insurance in Shanghai. Established in 1955, this hospital belongs to Shanghai Shipping (Group) Company, and is the teaching hospital of Nantong Medical College and Anhui Medical University, the acupuncture practice base of Shanghai University of Traditional Chinese Medicine, and the specialized hospital of Japan Foreign Airlines Crew Medical Group in China, which undertakes the experience of emigrating to Canada, Australia and New Zealand and the foreign-related marriage examination in Shanghai. It is an institution integrating medical treatment, teaching, scientific research, prevention, epidemic prevention and health care.

This hospital is not big, and the crew and fishermen's friends usually have physical examinations here.