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For
power-driven
Underway
vessels
underway.
For
power-driven
vessel that is
stationary.
Stopped
For sailboats,
tug boats and
Sailboat
tow boats
underway.
One 5-second blast at 120-second interval.
Two 3-second blasts, with a 2-second
interval between each blast, repeated every
120 seconds.
One 3-second blast, followed by one
2-second interval, one 1-second blast, one
2-second interval and one 1-second blast.
Repeated every 120 seconds.
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