In restricted visibility, vessels are required to sound a signal of one prolonged blast every two minutes. This signal serves to alert other vessels of their presence and help prevent collisions. The sound should be made using a whistle, horn, or other sound-producing device that can be heard clearly over the surrounding environment. Additionally, smaller vessels may use a series of short blasts as an alternative signal.
one prolonged blast
One prolonged blast should be sounded every two minutes.
one prolonged blast
one prolonged blast
one prolonged blast
One prolonged blast
One prolonged blast should be sounded every two minutes.
One prolonged blast should be sounded every two minutes.
one prolonged blast every 2 minutes
one prolonged blast
In restricted visibility, a power-driven vessel underway is required to sound one prolonged blast every 2 minutes. This signal indicates the vessel's presence and helps prevent collisions when visibility is limited. The prolonged blast typically lasts about 4 to 6 seconds.
In restricted visibility, a power-driven vessel under way is required to sound one prolonged blast every 2 minutes. This signal is used to indicate the vessel's position and to alert other vessels in the vicinity. The prolonged blast lasts for about four to six seconds.