A power-driven vessel under way is required to sound one prolonged blast every 2 minutes. This signal indicates its presence and is meant to alert other vessels, especially in restricted visibility conditions. The prolonged blast lasts for about four to six seconds.
One prolonged blast should be sounded every two minutes.
one prolonged blast
one prolonged blast
One prolonged blast should be sounded every two minutes.
one prolonged blast every 2 minutes
One prolonged blast should be sounded every two minutes.
one prolonged blast
one prolonged blast
one prolonged blast
one prolonged blast
One prolonged blast
One prolonged blast