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They are indicating dangerous
They intend to pass starboard to starboard side.
Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”
When vessels in sight of one another are approaching each other and from any cause either vessel fails to understand the intentions or actions of the other, or is in doubt whether sufficient action is being taken by the other to avoid collision, the vessel in doubt shall immediately indicate such doubt by giving at least five short and rapid blasts on the whistle
In the Navy, it means there is an eminent collision.With all due respect, this is an incorrect answer.From the 1972 Convention of International Regulations for Preventing Collisions at Sea.InternationalSounds and Light signalsRule 34(D) When vessels are in sight of one another and from any cause either vessels fails to understand the intentions or actions of the other, or is in doubt whether sufficient action is being taken by the other to avoid collision, the vessel in doubt SHALL immediately indicate the doubt by giving at least 5 short and rapid blasts of the whistle.
Three short blasts means you are operating in reverse. One prolonged blast followed by 3 short blasts means boat under tow in redcued visibility conditions.
It is the "Masters Salute", a salute to the Master of another vessel.
Means it's about to turn to port.
Two short blasts mean that one intends to overtake the other on the port side. One short blast, on the other hand, means that one intends to overtake the other on the starboard side.
on short blast
2 short blasts
5 short blasts.