One short blast tells other boaters, “I intend to pass you on my port (left side). Two short blasts tell other boaters, “I intend to pass you on my starboard (right) side. Three short blasts tell other boaters, “I am backing up.
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The general emergency alarm on the ship is recognised by 7 short ringings of the bell followed by a long ring or using the ship horn signal of 7 short blasts followed by 1 long blast.
Passing Starboard to StarboardIf you approach another vessel head on, and wish to pass it on its starboard side, you are required to sound two short blasts with your horn.
Five Short Blasts - This is the DANGER signal. Remember, that when you approach another vessel and hear either one or two short blasts, and you both understand their signal and can safely let them do it, then you are required to respond with the same signal in response.
Horns can warn boats away from ships, structures and areas where they might run aground. And mariners can use the sounds along with their charts to navigate when their view is impaired by fog, smoke and heavy rain.