one short blast
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A power-driven vessel under way sounds one prolonged blast not less than every two minutes. However if it is less than 12meters in length it is not required to give any signal.
one prolonged blast
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
In restricted visibility, a power-driven vessel underway is required to sound one prolonged blast every 2 minutes. This signal is meant to indicate the vessel's presence to other nearby vessels in low visibility conditions. The prolonged blast lasts for about 4 to 6 seconds. This sound signal helps enhance safety by alerting others to the vessel's location, allowing for better navigation and collision avoidance.
Assuming you are referring to a fog horn or a warning signal, generally find where the other vessel is and change course accordingly
There are many signals a complete list cam be found in the rules for avoiding collisions at sea
one prolonged blast
one prolonged blast
one prolonged blast
One prolonged blast