警けい備び艦かん

noun

guard ship; patrol vessel

A ship used for guarding, patrolling, or security duties, often by a coast guard or navy.

• 海かい上じょう保ほ安あん庁ちょうの警けい備び艦かんが領りょう海かいを巡じゅん回かいしている。

  A Japan Coast Guard patrol vessel is patrolling the territorial waters.