According to maritime regulations, four long blasts of a ship's horn indicate that the ship is getting ready to depart. Phil Hanbidge. Amateur Marine Historian, 39 years with the Cdn Coast Guard Author has 340 answers and 704.5K answer views 4y.
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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.
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.
Stabilizers serve an essential function on cruise ships. They are fins or rotors beneath the water line, extended from the ship's hull to stabilize the ship and prevent it from rolling. This rolling could result from either wind or waves, and the stabilizer steadies the ship.