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When visibility is very limited, such as in heavy fog, boaters must give an audible signal to others in the area. For a sailboat the signal is one prolonged blast plus two short blasts every two minutes.
The sound signals that it is a sailing vessel underway when you hear one prolonged blast plus two short blasts every two minutes.
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 should be sounded every two minutes.
one prolonged blast every 2 minutes