3 short horn blasts, means “I am going backwards or astern”, so 3 blasts are not without meaning. Three long blast also have a meaning, they are meaning internationally (when leaving a harbor) “I am crossing”.
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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.
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.
One short blast tells other boaters, “I intend to pass you on my left (port) side.” Two short blasts tell other boaters, “I intend to pass you on my right (starboard) side.” Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”