Together with her sister ships GC 1, 2, 5, 6 and 7 built between 1924 and 1925 in the USA of wood. With a displacement of 37 tons were her dimensions 75 x 13¾ x 4 feet. The armament consisted of 1-1pdr, 1 machinegun and four depth charges. The petrol motor supplied 400 bhp allowing a speed of 13.5 knots
