3.1 These non-mandatory Guidelines are intended
to provide general advice about reduction of underwater noise to designers,
shipbuilders and ship operators. They are not intended to form the
basis of a mandatory document.
3.2 Given the complexities associated with ship
design and construction, the Guidelines focus on primary sources of
underwater noise. These are associated with propellers, hull form,
onboard machinery, and operational aspects. Much, if not most, of
the underwater noise is caused by propeller cavitation, but onboard
machinery and operational modification issues are also relevant. The
optimal underwater noise mitigation strategy for any ship should at
least consider all relevant noise sources.
3.3 These Guidelines consider common technologies
and measures that may be relevant for most sectors of the commercial
shipping industry. Designers, shipbuilders, and ship operators are
encouraged to also consider technologies and operational measures
not included in these Guidelines, which may be more appropriate for
specific applications.