Underwater radiated noise spectrum per vessel at most used operational speed
Measurement answer
What this metric measures
Reports each vessel's underwater radiated-noise spectrum at its most used operational speed, using either Source Level or Radiated Noise Level as defined in the ISO 17208 reference.
Specification
Metric specification
- Result format
- Structured table
- Unit
- dB re 1 μPa·m; reported as a Source Level (SL) or Radiated Noise Level (RNL) spectrum — source-defined reporting unit
- Reporting basis
- Reporting period for which the vessel's most used operational speed and associated underwater radiated-noise spectrum are reported
- Aggregation
- Per vessel; no aggregate across vessels is specified
- Pillar
- Environmental
- Topic
- Pollution
- Controlled domain
- Pollution
- Entity type
- Metric
Reporting boundary
Each reporting organization vessel, measured or modelled at that vessel's most used operational speed
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- Additional sector guidance – Fishing v1.0 (June 2025), p.86, Table 17, F.A2.0
- Adopting DisclosureF.A2.0
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2025
- Requirement
- Recommended
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- Additional sector guidance – Fishing v1.0 (June 2025), p.86, Table 17, F.A2.0
Value structure
Dimensions and units
- Unit
- dB re 1 μPa·m; reported as a Source Level (SL) or Radiated Noise Level (RNL) spectrum — source-defined reporting unit
- Reporting basis
- Reporting period for which the vessel's most used operational speed and associated underwater radiated-noise spectrum are reported
Unit meaning: Values use dB re 1 μPa·m; reported as a Source Level (SL) or Radiated Noise Level (RNL) spectrum under the disclosed TNFD sector-guidance method, reporting period and boundary.
Table fields and units
- vessel identifier
- most used operational speed
- noise-level basis (SL or RNL)
- frequency band or frequency
- underwater radiated noise level
- unit
- measurement or modelled approach
- method or ISO 17208 reference
Published dimensions
- vessel
- most used operational speed
- noise-level basis: Source Level (SL) or Radiated Noise Level (RNL)
- frequency spectrum
- measurement or modelled approach
Calculation method
Formula information
- Status
- Specified
- Formula type
- Other
Formula
For each vessel, report the underwater radiated-noise spectrum at its most used operational speed as either an SL spectrum or an RNL spectrum.Apply the source-defined TNFD sector-guidance method within the stated reporting boundary. This is a standalone additional-sector Fishing outcome metric with an explicit vessel-level population, operational condition, spectrum-shaped result, unit, and ISO-based measurement basis. It is distinct from generic light/noise management disclosures and from average on-site noise measures because it concerns underwater vessel radiated noise and retains the SL/RNL spectrum variant.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
v | Vessel | Individual vessel for which the underwater radiated-noise spectrum is reported. | vessel identifier |
s_v | Most used operational speed | Operational speed most used by vessel v and used as the reporting condition. | not specified |
N_v(f) | Underwater radiated noise spectrum | Source Level or Radiated Noise Level for vessel v by frequency or frequency band at its most used operational speed. | dB re 1 μPa·m |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 30 August 2026
TNFD additional sector guidance collection
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Locator
- Additional sector guidance – Fishing v1.0 (June 2025), p.86, Table 17, F.A2.0
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Underwater radiated noise spectrum per vessel at most used operational speed”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: TNFD sector guidance, Final English sector guidance collection through August 2026 (17 documents).
- State whether the spectrum is reported as SL or RNL.
- State the vessel's most used operational speed used for reporting.
- Disclose whether the spectrum is measured or modelled.
- Where modelled, disclose the modelling approach and relevant assumptions.
- Apply or identify the ISO 17208 basis referenced by the guidance.
Record-specific limitations
- The guidance acknowledges that modelled approaches may be necessary because underwater-noise measurement technologies are evolving.
- The extracted specification does not prescribe a cross-vessel aggregation method.
- SL and RNL are alternative reported noise-level bases and must not be treated as interchangeable without disclosure.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.