Malaysia legislation
Section 33
of Ports And Harbours Ports Harbours And Dues Regulations 2008
Section 33
No steam whistle, siren, mechanical horn or other like instrument shall be used within port limits except –
(a)
as a signal of danger or emergency;
(b)
in conformity with the Collision Regulations at Sea 1972; or
(c)
as required in subregulation 18(2).
Loading or discharging of cannon, gun, etc.