#Low rumble and fog horn sound code#
And a Morse code dash represents the prolonged blast of four to six seconds long.Moved into this house last year with a "Worcester Bosh Greenstar HE Condensing Combi". A good alternative is to use one of the many laminated visual shorthand versions of COLREGS sold at ship chandleries.įor sound signals, a Morse code dot represents the short blast of about one-second duration. Trying to quickly look up a sound signal heard in the fog by turning to Rule 35 in COLREGS can be a bit of a challenge. With the large number of sound signals available for use in restricted visibility, remembering all the possibilities can be difficult. They also can make some other efficient sound signal at intervals of not more than two minutes. Vessels less than 12m LOA are NOT required to use any of the sound signals required for vessels in restricted visibility. Instead, she shall make some other efficient sound signal at intervals of not more than two minutes. To further finesse Rule 35, The International Regulations for Preventing Collisions at Sea (IRPCS), doesn’t oblige the bell signals to be used at anchor and when aground for vessels 12m (39ft) or more, but less than 20m (65.6ft) in length.
If aground, a vessel shall give the bell signal and if required the (at anchor) gong signal prescribed … and shall, in addition, give three separate and distinct strokes on the bell immediately before and after the rapid ringing of the bell.There are two classes of working vessels that do not use the bell and gong signals while at anchor.Ĭommercial fishing boats that are fishing while at anchor, and vessels restricted in their ability to maneuver that are carrying out their work while at anchor must use the encumbered vessel sound signal of one prolonged and two short blasts. In addition, any vessel at anchor can also sound one short, one prolonged and one short blasts as a collision avoidance warning.Larger vessels, those 100m (328ft) or more in length, also use a gong.įor these large yachts and ships, the bell is rapidly sounded from the foredeck, and immediately followed by the gong sounded rapidly from the afterdeck, both for about five seconds.While at anchor, ringing the ship’s bell rapidly for about five seconds at intervals of no more than one minute is the primary sound signal for smaller vessels.The tug itself first sounds its own signal for an encumbered vessel, and if possible, the manned tow sounds its own signal immediately after. If a vessel being towed is manned, that tow or barge shall sound one prolonged blast followed by three short blasts.These encumbered vessels are those not under command, restricted in their ability maneuver due to their work, constrained by draft, sailing, engaged in commercial fishing and towing or pushing another vessel. Vessels that are encumbered, due to their maneuverability or their ranking in the hierarchy of responsibilities between vessels in Rule 18, shall sound one prolonged blast followed by two short blasts.A pilot vessel, engaged in pilotage duty, may also sound four short blasts in addition to the sound signals required by a power-driven vessel.A power-driven vessel underway but stopped shall sound two prolonged blasts.A power-driven vessel making way shall sound one prolonged blast.COLREGS lists the following sound signals for vessels underway: In restricted visibility, the two minutes allows the look-out to listen for sound signals from other vessels groping their way through the fog. Why a two minute rule? A requirement for all vessels is to maintain a proper look-out by sight and hearing. The Rules of the Road state when underway ‘vessels shall sound at intervals of not more than two minutes’ the prescribed sound signal.
Rule 35 is fairly complex, and it is advised to have a highlighter in hand while reading through it. The bell and gong are added into the mix of whistle sounds used as options for restricted visibility signals.
Sound signals for vessels in restricted visibility, whether underway, at anchor or aground, day or night, are the subject of Rule 35 ( COLREGS). Fog, mist, falling snow, heavy rainstorms, sandstorms or any other similar causes can make conditions that hamper visibility.
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