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.
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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.
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.
All ships creak and groan with the flexing of the hull as the seas exert forces against it. Of course, the heavier the seas, the more of this you will notice. In calm seas you'll hear less of these sounds.
The alarm signal for a Man Overboard is three long blasts on the general alarm and ship's whistle. If you hear this alarm, muster on the main deck and attempt to maintain visual contact of the victim while pointing in the victims direction when in sight.
Think of the phrase 'there is no RED PORT LEFT in the bottle', which helps to associate the colour red, as in the port drink, and left with the corresponding side of the ship.