All were manned exclusively by CRNVR personnel. These ships were meant to sweep and guard the approaches the harbors but were often used on extended missions outside Ceylon waters. In the course of these operations, the ships came under enemy fire, recovered essential information from Japanese aircraft that were shot down, sailed to Akyab after the Burma front was opened in two FMVs for harbour duties and, was called upon to accept the surrender of the Italian light cruiser Eritrea and escort her to port with a prize crew on board.
All were crewed exclusively by CRNVR personnel. These ships were intended to patrol and safeguard the entrances to harbors but were frequently utilized on prolonged missions beyond Ceylon waters. Throughout these operations, the vessels came under enemy fire, recovered vital information from Japanese aircraft that were shot down, sailed to Akyab after the Burma front was opened in two FMVs for harbour duties and, was called upon to accept the surrender of the Italian light cruiser Eritrea and escort her to port with a prize crew on board.