Section 136 in The Andaman and Nicobar Islands Port Rules, 2004
136. Local Signals.
(a)All Signals shall be made vessels by using the International Code of Signals and shall be acknowledged by the code pendant being hoisted at the flag mast head.(b)Morse, Flags, Flashlights, Semaphore, VHF IHF radio telephone may be used as means for communicating with the Port Control Towers.(c)All vessels shall call Port Control Towers by using Flag 'Z' by day and by flashing' Z' at short intervals by night.(d)All night signals shall be made in one hoist, with the lights in a vertical line one over the other not less than one meter apart.(e)Detail of Local signals (by day & by night) giving, their meanings is placed at Schedule-I.
