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Annex III - Technical Details of Sound Signal Appliances

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1. Whistles - International

  1. Frequencies and range of audibility
    The fundamental frequency of the signal shall lie within the range 70-700 Hz. The range of audibility of the signal from a whistle shall be determined by those frequencies, which may include the fundamental and/or one or more higher frequencies, which lie within the range 180-700 Hz (± 1%) for a vessel of 20 metres or more in length, or 180-2100 Hz (± 1%) for a vessel of less than 20 metres in length and which provide the sound pressure levels specified in paragraph (c) below.
  2. Limits of fundamental frequencies
    To ensure a wide variety of whistle characteristics, the fundamental frequency of a whistle shall be between the following limits:
    1. 70-200 Hz, for a vessel 200 metres or more in length;
    2. 130-350 Hz, for a vessel 75 metres but less than 200 metres in length;
    3. 250-700 Hz, for a vessel less than 75 metres in length.
  3. Sound signal intensity and range of audibility
    A whistle fitted in a vessel shall provide, in the direction of maximum intensity of the whistle and at a distance of 1 metre from it, a sound pressure level in at least one 1/3rd octave band within the range of frequencies 180-700 Hz (± 1%) for a vessel 20 metres or more in length, or 180-2100 Hz (± 1%) for a vessel less than 20 metres in length, of not less than the appropriate figure given in the table below.

 

Length
of vessel
in meters 		1/3rd-octave band
level at 1 meter
in dB referred to
2×10-5 N/m2 		Audibility
range in
nautical
miles
200 or more 143 2
75 but less than 200 138 1.5
20 but less than 75 130 1
Less than 20 120*1 0.5
115*2
111*3

*1 When the measured frequencies lie within the range 180-450 Hz
*2 When the measured frequencies lie within the range 450-800 Hz
*3 When the measured frequencies lie within the range 800-2100 Hz

The range of audibility in the table above is for information and is approximately the range at which a whistle may be heard on its forward axis with 90 per cent probability in conditions of still air on board a vessel having average background noise level at the listening posts (taken to be 68 dB in the octave band centred on 250 Hz and 63 dB in the octave band centred on 500 Hz).
In practice the range at which a whistle may be heard is extremely variable and depends critically on weather conditions; the values given can be regarded as typical but under conditions of strong wind or high ambient noise level at the listening post the range may be much reduced.

  • d. Directional Properties
    The sound pressure level of a directional whistle shall be not more than 4 dB below the prescribed sound pressure level on the axis at any direction in the horizontal plane within ± 45 degrees of the axis. The sound pressure level at any other direction in the horizontal plane shall be not more than 10 dB below the prescribed sound pressure level on the axis, so that the range in any direction will be at least half the range on the forward axis. The sound pressure level shall be measured in that 1/3rd-octave band which determines the audibility range.
  • e. Positioning of whistles
    When a directional whistle is to be used as the only whistle on a vessel, it shall be installed with its maximum intensity directed straight ahead.
    A whistle shall be placed as high as practicable on a vessel, in order to reduce interception of the emitted sound by obstructions and also to minimize hearing damage risk to personnel. The sound pressure level of the vessel’s own signal at listening posts shall not exceed 110 dB(A) and so far as practicable should not exceed 100 dB(A).
  • f. Fitting of more than one whistle
    If whistles are fitted at a distance apart of more than 100 metres, it shall be so arranged that they are not sounded simultaneously.
  • g. Combined whistle systems
    If due to the presence of obstructions the sound field of a single whistle or of one of the whistles referred to in paragraph 1(f) above is likely to have a zone of greatly reduced signal level, it is recommended that a combined whistle system be fitted so as to overcome this reduction. For the purposes of the Rules a combined whistle system is to be regarded as a single whistle. The whistles of a combined system shall be located at a distance apart of not more than 100 metres and arranged to be sounded simultaneously. The frequency of any one whistle shall differ from those of the others by at least 10 Hz.

Whistles - Canadian Modifications

  • h. Notwithstanding paragraph (a), in the Canadian waters of a roadstead, harbour, river, lake or inland waterway, the upper limit of the frequency range referred to in that paragraph may be expanded to be within the range of 180-2100 Hz (± 1 per cent).
  • i. Notwithstanding paragraph (c), in the Canadian waters of a roadstead, harbour, river, lake or inland waterway, the whistle on a vessel of 12 metres or more in length but less than 20 metres in length may provide, in the direction of the forward axis of the whistle and at a distance of 1 metre from it, a sound pressure level in at least one 1/3rd-octave band of not less than the appropriate figure shown below within the frequency range of 250-2100 Hz (± 1 per cent):
    1. 250-450 Hz - 120 dB
    2. 450-800 Hz - 115 dB
    3. 800-2,100 Hz - 111 dB
  • j. For the purposes of this Annex, the expression “listening posts” means bridge wings or the bow.
  • k. For the purposes of this Annex, the methods described in Resolution A.343(IX), made by the Organization, for measuring noise levels at listening posts are recommended.
  • l. In the Canadian waters of a roadstead, harbour, river, lake or inland waterway, a power-driven vessel that is normally engaged in pushing ahead or towing alongside may, at any time, use a whistle whose characteristic falls within the limits prescribed in paragraph (b) for longest normal length of the vessel and its tow.

2. Bell or gong

  1. Intensity of Signal
    A bell or gong, or other device having similar sound characteristics shall produce a sound pressure level of not less than 110 dB at a distance of 1 metre from it.
  2. Construction
    Bells and gongs shall be made of corrosion-resistant material and designed to give a clear tone. The diameter of the mouth of the bell shall be not less than 300 mm for vessels of 20 metres or more in length. Where practicable, a power-driven bell striker is recommended to ensure constant force but manual operation shall be possible. The mass of the striker shall be not less than 3% of the mass of the bell.

3. Approval - International

  1. The construction of sound signal appliances, their performance and their installation on board a vessel shall be to the satisfaction of the appropriate authority of the State whose flag the vessel is entitled to fly.

Approval - Canadian Modification

  • b. For the purpose of paragraph (a), the appropriate Canadian authority is the Minister.

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Date modified:
2012-02-24