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POL Government Elected Officials Auditor Griffin-Valade Charter, Code & Policies City Code & Charter Online Code & Charter Title 19 Chapter 19.16  Rules And Regulations
19.16.435 Standard Whistle Signal for Fire in Port.

In the event of fire occurring on board any vessel or watercraft in the Portland harbor, except those under way, it may sound five prolonged blasts of whistle or siren as an alarm indicating fire on board or at the dock to which it is moored.  The signal may be repeated at intervals to attract attention and is not a substitute for, but may be used in addition to, other means of reporting a fire.  The words “prolonged blast” used in this Section shall mean a blast of 4 to 6 seconds duration.