Rules of the Road. Rule 35, Sound Signals in Restricted Visibility.
(C) A vessel not under command, a vessel restricted in her ability to maneuver, a vessel constrained by her draft, a sailing vessel, a vessel engaged in fishing, and a vessel engaged in towing or pushing another vessel SHALL, sound at intervals of not more than two minutes three blast in succession, namely one prolonged followed by two short blast.
The sound signals that it is a sailing vessel underway when you hear 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.
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.
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.
one prolonged blast
one prolonged blast
one prolonged blast
one prolonged blast
one prolonged blast
one prolonged blast
One prolonged blast
One prolonged blast