Hi convoys  Convoy routing was through the East China Sea, Formosa Strait, and South China Sea. Ships often joined or left convoys at the Formosan ports of Takao and Keelung, at the Mako naval base in the Pescadores, and at the Vietnamese ports of Cape Saint Jacques and Cam Ranh Bay. Some convoys stopped at Manila until MATA and TAMA feeder convoys between MAnila and TAkao enabled Hi convoys to avoid United States submarine wolfpacks in the Luzon Strait by hugging the Asian coast between Hainan and Shanghai.