Japanese Coast Guard Izu (PL-31)

Hateruma class patrol vessel is a class of PL type patrol vessels of the Japan Coast Guard. PL stands for "Patrol vessel Large", and the class name "Hateruma" is named after Hateruma-jima, the southernmost inhabited island of Japan.

Aiming at policing of Senkaku Islands, they can be floating base for smaller patrol crafts or helicopters, so they are called Patrol vessel, Sea-basing capability enhanced.