RINA DOLPHIN QUIET-SHIP Notation

RINA's underwater-radiated-noise (URN) notation - aligned with IMO MEPC.1/Circ.906 and ABS UWN.

ClassRINANoise

Vessel categoryMeasured URN at 10 m (dB re 1 μPa)dB

DOLPHIN QUIET-SHIP limit: 160dB

Compliance: Exceeds notation limit

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{URN}_\text{measured} \leq \text{Limit}_\text{category}

Symbol	Meaning	Unit
$URN$	Underwater radiated noise	dB re 1 μPa at 1 m

Source: IMO MEPC.1/Circ.906 - URN guidelines; ISO 17208 - URN measurement

In short

RINA's underwater-radiated-noise (URN) notation - aligned with IMO MEPC.

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