警けい備び艇てい

noun

patrol boat; guard boat; guardship

A small vessel used for security, patrol, or guard duties, often by coast guard, police, or military forces.

• 沿えん岸がん警けい備び隊たいの警けい備び艇ていが不ふ審しん船せんを追つい跡せきした。

  The coast guard's patrol boat pursued the suspicious vessel.