A power-driven vessel underway typically sounds one prolonged blast of the horn or whistle at intervals of not more than two minutes. This signal indicates its presence and is used to communicate with other vessels, especially in conditions of reduced visibility. The prolonged blast lasts about four to six seconds.
one prolonged blast
one prolonged blast
one prolonged blast
One Prolonged Blast.
one prolonged blast
One Prolonged Blast.
One prolonged blast
One prolonged blast
one prolonged blast.
one prolonged blast
One prolonged blast
one prolonged blast