DNV SILENT Notation Tiers
DNV SILENT tiers by application: SILENT-A (seismic), SILENT-F (fishery research), SILENT-R (scientific research), SILENT-E (environmental).
URN limit for tier
160dB
Status
Compliant for SILENT-E
Formula, assumptions, and limits
SILENT-F is the strictest (ICES CRR 209 fisheries limit). SILENT-A is the broadest - 'quiet for the area' rather than specific activity. DNV allows combination with SILENT-R for dual-purpose research+fishery vessels.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| DNV tier letters | - | DNV Rules Pt.6 Ch.24 |