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A muffler system must be installed in a powerboat to prevent excessive or unusual noise.
muffler system
muffler
when you want to kill silently
the powerboat must yeild to the sail boat
A white masthead light must be shown when a powerboat is operating at night.
P.B. "B" is the give way vessel to P.B. "B" who is the stand on vessel. "A" must not impede "B".
A whistle or horn.
A sailboar with its engine engages
A sailboar with its engine engages
A sailboat with its engine engaged
Green muffler is used to fight noise pollution.