Fog horn sound meaning11/8/2023 ![]() Ships longer than 100m ring the bell at the bow end and follow it with beating a gong for five seconds at the stern. Ships under 100m, at anchor, ring a bell for 5 seconds at least every minute. They sound bells and gongs, although, if they become alarmed, they may add a supplementary sound signal via their hooter. ![]() Ships at anchor and ships aground do NOT use the hooter. The towing vessel should do its one long and two short and then, after a SHORT pause, the vessel being towed should emit one long and three short blasts. These sounds should be co-ordinated into a set. While the towing vessel makes the sound for a vessel restricted in its ability to manoeuvre, the vessel being towed has a sound signal all of its own and that is one long blast followed immediately by THREE short blasts. Towing vessels should make an additional sound signal to alert other shipping to the extra hazard they represent. One long blast followed immediately by two short blasts (again, every two minutes or less). Power boats engaged in work that makes them less manoeuvrable such as boats fishing, dredging, and towing, ships constrained by their draft and all sailing boats. The second set – Making way but restricted in their ability to manoeuvre So if you hear a ‘large vessel blast’ you should be extra alert. It is worth remembering the very large ships can neither turn, stop or reverse in order to avoid you. The blast the Queen Mary II makes will not be confused with the sound your berth neighbour´s Sea Ray emits. You don´t have to worry to much about the size of the vessel. Ships in this state all should make the same sound signal : One long blast every two minutes or less.Ī ship or boat that is merely stationary but not at anchor (underway, but not making way) gives two long blasts every two minutes or less.Ī pilot boat, for some reason, is allowed to add a further signal to its powerboat sound – four short blasts. The only boats classed as unrestricted in their ability to manoeuvre are power boats of all shapes and sizes, making way, but not engaged in any restrictive works such as fishing, dredging or towing, nor constrained by their draft. The first set - Making way and unrestricted in their ability to manoeuvre At anchor or underway but not making way or finally aground Making way but restricted in their ability to manoeuvre ģ. Making way and unrestricted in their ability to manoeuvre:Ģ. The best way to remember these sound signals is to split them by ship condition:ġ. Sound signals in reduced visibility (fog)
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