Question: What Do Cruise Ship Horn Blasts Mean?

How does a cruise ship horn work?

Larger air horns used on ships and foghorns function similarly to a whistle; instead of a diaphragm the air escapes from a closed cylindrical resonator chamber through a precisely shaped slit directed against a knife edge (fipple).

The air blowing past the knife edge oscillates, creating sound waves..

What does 7 blasts on a ship’s horn mean?

The signal is composed of seven or more short blasts followed by one long blast on the ship’s whistle and internal alarm system. … The signal alerts passengers of an emergency so that they will begin proper procedures in which all persons collect their life jackets and proceed to their assigned muster stations.

What does 4 blasts of a ship horn mean?

prepares to depart the dock the skipper gives four blasts on the horn to alert local boaters they are getting underway.

What do fog horn blasts mean?

The use of appropriate foghorn sound signals in foggy conditions indicate whether the vessel is sailing or motoring, aground, or at anchor. Fog horn sound signals are either prolonged (four to six seconds) or short (one second). … Under way but not making way: Two long horn blasts at two-minute intervals.

What side do you pass an oncoming boat?

If another vessel is approaching you from the port — or left — side of your boat, you have the right of way and should maintain your speed and direction. 2. If a vessel is aiming to cross your path and they’re on your starboard — or right — side, they have the right of way.

What do ship horn blasts mean?

One Short Blast – This means “I intend to leave you on MY port side”. … If you are behind another boat, going the same direction and about to overtake it, one short blast means: “I intend to pass you on YOUR starboard side, MY port side”. One Prolonged Blast – This means you are leaving a dock or departing your slip.

What does it mean when a ship blows its horn 3 times?

It can be used to indicate you are approaching a bend in a river where oncoming traffic might not see you. It can also mean you are leaving your dock or slip. You can combine 1 long blast followed by 3 short blasts to indicated backing out of your dock or slip.

What do 2 short blasts from a horn mean?

tell other boatersTwo short blasts tell other boaters “I intend to pass you on my right (starboard) side.” Three short blasts tell other boaters “I am backing up (operating astern propulsion).”

What does it mean when you hear one prolonged blast every two minutes?

One prolonged blast at intervals of not more than two minutes is a signal used by power driven vessels when underway. One prolonged blast, plus 2 short blasts at intervals of not more than two minutes apart, is the signal used by sailing vessels.