Clasification Society Rulefinder 2022 - Version 9.36
Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.343(IX) - Recommendation on Methods of Measuring Noise Levels at Listening Posts - (Adopted on 12 November 1975) - Appendix - Provisional Guidelines on Maximum Acceptable Noise Level at Listening Posts

Appendix - Provisional Guidelines on Maximum Acceptable Noise Level at Listening Posts

1. It is desirable that the background noise levels at listening posts should not on average exceed the noise level defined by octave-band levels as follows:
  • (a) 68 dB in the band centred on 250 Hz;
  • (b) 63 dB in the band centred on 500 Hz.

2. Ship designers and builders should be encouraged to meet this requirement in new vessels. Measurements should be made when possible in accordance with the method recommended above, in order to check results.

3. So far as existing vessels are concerned, it is recognized that problems of a ship construction nature may make it difficult, if not impossible, to meet the requirement. These vessels should therefore comply as far as is feasable.

4. On the basis of information received from Administrations concerning noise levels measured on existing vessels, IMCO will give further consideration to the possibility of making a Recommendation on maximum permissible noise levels at listening posts

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