In the event of fire occurring on board any vessel in any navigable
waters in the Raritan River, Raritan Bay and Kill Van Kull, except
vessels under way, such vessels may sound five (5) prolonged blasts
of the whistle or siren as an alarm indicating fire on board or at
the dock to which the vessel is moored. Such 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 chapter shall mean
a blast off from four (4) to six (6) seconds duration.