(1)The master of any vessel arriving at the port with ammunition, explosives, or over 100 lb. (45 Kgs.) in weight of gun powder, on board a cargo, shall display a red flag 'B' of the International Code at the fore during day-time ; and between sunset and sunrise shall exhibit, when at anchor, a white light over three red lights hoisted in a vertical line one over the other not less than 3 (three) feet apart for such time as the ammunition, explosives or gunpowder may be on board within port limits.(2)When it is necessary to attract attention of another vessel, the person in-charge of a power driven vessel shall do so one prolonged blast of not more than 30 seconds duration on the whistle. This signal shall not be used on any occasion or for any purpose other than as provided by this rule.(3)The signal of steam whistle prescribed in the Collision Regulations and Rule 16 (b) of these rules shall not be used on any occasion or for any purpose otherwise than as therein provided and no other signal by whistle shall be made other than those therein, prescribed.(4)When at anchor between sunset and sunrise all cargo boats, flats and passenger boats irrespective of tonnage shall carry in the forward part of the vessel where it can best be seen a white light at night not exceeding 20 feet above the hull and constructed to show a clear light all round the horizon.
