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Q: Does anyone know what is the meaning of four short blasts on a ship's horn?
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What is the meaning of seven blasts?

Five or more short blast on a ships whistle, while under way, is the signal for risk of collision.


What does one long blast followed by two short blasts from a lake freighter mean?

It is called a short salute and is how ships greet each other.


What sounds signal alerts other that a boat is backing up?

3 short blasts


What does 3 long and 2 short blasts mean from a great lakes ship?

It is the "Masters Salute", a salute to the Master of another vessel.


What is the meaning of 3 long and 1 short on a ships horn?

There are particular sound signals that are to be used when you first get underway. One prolonged blast signifies that you are about to get underway. If you are going to make way in reverse, you need to signal an additional 3 short blasts.


What do five or more blasts mean when you are boating?

5 short blasts is a signal warning of imminent danger (or disagreement).


What is the meaning of a prolonged blast plus two short blasts every two minutes?

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.


What do two short blasts of a boat horn mean?

Passing on your right side.Signals are (number of blasts):1. Passing you on your left (port) side2. Passing you on your right (starboard) side3. I am moving backwards (astern)4. Danger, don't do that (answer to the other three if dangerous)One short blast means 'I am changing course to starboard.'Two short blasts mean 'I am changing course to port.'Three short blasts mean 'I am operating astern.'Two prolonged blasts followed by one short blast to mean 'I intend to overtake you on your starboard side';Two prolonged blasts followed by two short blasts to mean 'I intend to over-take you on your port side.'A long blast every two minutes is used when operating in fog.


What does 3 short blast of a horn mean when boating?

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.


What do two short blasts mean?

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.


3 short blasts of a horn mean on a boat?

Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”


What signal alerts that a boat is backing up?

3 short blasts