Section 76(1) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(1)Vessels other than ships of War employed in Naval service by the Government whether belonging to or under charter to Government shall wear the Blue Ensign defaced by an anchor in horizontal position. The Anchor emblem shall be in yellow colour and be displayed in the centre of the fly. The dimension of the emblem shall not exceed that of a circle whose diameter is 13/30th of the width of the flag.
