Originally Posted by Healer52
OK, so what rule
defines the correct pattern for a sailboat anchored in the fog's horn? Bell?
of the rules have been underlined at the bottom of this post.
Let's assume a 10m boat.
Under rule 33b (Colregs and US Inland rules) she is required to carry a means of making an efficient sound signal but not necessarily one that complies with Annex III. Let's say she's carrying a 'horn'.
Under rule 35g generic anchored vessels are required to rapidly ring bell for 5s at 1m intervals (plus gong if over 100m), with an optional whistle blast of short-long-short, presumably just before or after bell ringing.
Under rule 35i an anchored vessel under 12 is exempted from 35g but shall make an efficient sound signal at not more than 2m intervals, no pattern specified.
I think the that short-long-short on a horn would be acceptable to meet 35i. However the 35g says short-long-short can be used in addition
to the bell signal perhaps implying that it may only be used in addition to and not on its own, but then we're back to what kind of a sequence would be appropriate for a horn alone. On another hand, a short, long, short is also "some other sound" (35i) as well. s-l-s is the only whistle/horn pattern I could find for anchoring
. Any pattern not specified in the rules has the potential to create confusion if vessels underway hear it but don't know what to make of it if it is not recognizable as having a specific use.
Do people have an opinion as to whether short-long-short on a horn/whistle can only be used with a bell or is it open to use on its own? Is there a widely used alternative that is not in the Colregs?
(a) The word "whistle" means any sound signaling appliance capable of producing the prescribed blasts and which complies with the specifications in Annex III to these [Regulations / Rules
(b) The term "short blast" means a blast of about one second's duration.
(c) The term "prolonged blast" means a blast of from four to six seconds' duration.
(a) A vessel of 12 meters or more in length
shall be provided with a whistle and a bell [INLD
], a vessel of 20 meters or more in length shall be provided with a bell in addition to a whistle [Intl],
and a vessel of 100 meters or more in length shall, in addition be provided with a gong, the tone and sound of which cannot be confused with that of the bell. The whistle, bell and gong shall comply with the specifications in Annex III to these Regulations
. The bell or gong or both may be replaced by other equipment
having the same respective sound characteristics, provided that manual sounding of the prescribed signals shall always be possible.
(b) A vessel of less than 12 meters in length shall not be obliged to carry the sound signaling appliances prescribed in paragraph (a) of this Rule but if she does not, she shall be provided with some other means of making an efficient signal.
Sound Signals in Restricted Visibility
In or near an area of restricted visibility, whether by day or night the signals prescribed in this Rule shall be used as follows: (a) A power driven vessel making way through the water
shall sound at intervals of not more than 2 minutes one prolonged blast.
(b) A power driven vessel underway but stopped and making no way through the water
shall sound at intervals of no more than 2 minutes two prolonged blasts in succession with an interval of about 2 seconds between them.
(c) A vessel not under command, a vessel restricted in her ability to maneuver, a vessel constrained by her draft
, a sailing vessel, a vessel engaged in fishing
and a vessel engaged in towing or pushing another vessel shall, instead of the signals prescribed in paragraph (a) or (b) of this Rule, sound at intervals of not more than 2 minutes three blasts in succession, namely one prolonged followed by two short blasts.
(d) A vessel engaged in fishing
, when at anchor
, and a vessel restricted in her ability to maneuver when carrying out her work at anchor, shall instead of the signals prescribed in paragraph (g) of this Rule sound the signal prescribed in paragraph (c) of this Rule.
(e) A vessel towed or if more than one vessel is being towed the last vessel of the tow, if manned, shall at intervals of not more than 2 minutes sound four blasts in succession, namely one prolonged followed by three short blasts. When practicable, this signal shall be made immediately after the signal made by the towing vessel.
(f) When a pushing vessel and a vessel being pushed ahead are rigidly connected in a composite unit they shall be regarded as a power driven vessel and shall give the signals prescribed in paragraphs (a) or (b) of this Rule.
(g) A vessel at anchor shall at intervals of not more than 1 minute ring the bell rapidly for five seconds.
In a vessel 100 meters or more in length the bell shall be sounded in the forepart of the vessel and immediately after the ringing of the bell the gong shall be sounded rapidly for about 5 seconds in the after part of the vessel. A vessel at anchor may in addition sound three blasts in succession, namely one short, one long and one short blast, to give warning of her position and of the possibility of collision to an approaching vessel.
(h) A vessel aground shall give the bell signal and if required the gong signal prescribed in paragraph (g) of this Rule and shall, in addition, give three separate and distinct strokes on the bell immediately before and after the rapid ringing of the bell. A vessel aground may in addition sound an appropriate whistle signal.
(i) A vessel of less than 12 meters in length shall not be obliged to give the above mentioned signals but, if she does not, shall make some other efficient sound signal at intervals of not more than 2 minutes.
(j) A pilotage vessel when engaged on pilotage duty may in addition to the signals prescribed in paragraph (a), (b) or (g) of this Rule sound an identity signal consisting of four short blasts.