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.
If a motorboat approaches head-on and sounds one short blast, you can signal your agreement to let it pass on your port (left) side by sounding one short blast in return. This indicates that you understand the intent and are allowing the other vessel to pass safely. Additionally, ensure your course remains steady and your vessel is properly positioned to facilitate the maneuver.
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.
A vessel that sounds the same fog signal whether underway or at anchor is a sailing vessel. According to the International Regulations for Preventing Collisions at Sea (COLREGs), a sailing vessel under sail alone is required to sound one prolonged blast followed by two short blasts. This signal is used to indicate its presence and position in reduced visibility conditions, regardless of its status.
A power-driven vessel underway in restricted visibility is required to sound one prolonged blast at intervals of not more than two minutes. This signal indicates the vessel's presence and helps prevent collisions. Additionally, if the vessel is making way through the water, it may also sound two short blasts to indicate its maneuverability.
one prolonged blast
one prolonged blast
In restricted visibility, a power-driven vessel under way is required to sound one prolonged blast every 2 minutes. This signal is used to indicate the vessel's position and to alert other vessels in the vicinity. The prolonged blast lasts for about four to six seconds.
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