Chamsuri class patrol vessels are naval boats that function as patrol craft. These entered service with the South Korean navy (South Korea) in the 70s, and have since seen service with three other navies, of which the Philippine Navy is currently the largest non-South Korean user. These boats were built by the Hanjin Industrial SB, Chinhae, and Korea SB & Eng. Masan shipyards. As newer, more capable patrol crafts enter South Korean navy service, the Chamsuri class boats are slowly being retired.