All vessels must have a sound signalling device such as a horn or a whistle.
Sound signals are often used by large vessels to indicate their manoeuvring intentions.
For example, the Manly ferry when about to reverse out of Circular Quay will communicate this to other vessels with three short blasts of their horn to raise awareness to other vessels in the vicinity.
Reverse, three short blasts.
All vessels must have a sound signalling device such as a horn or a whistle.
Sound signals are often used by large vessels to indicate their manoeuvring intentions.
For example, the Manly ferry when about to reverse out of Circular Quay will communicate this to other vessels with three short blasts of their horn to raise awareness to other vessels in the vicinity.
Reverse, three short blasts.