IMO Noise Code Applicability and Cabin Limit Checker

Before an acoustic target is quoted at you as a statutory requirement, it is worth checking whether the Code on Noise Levels On Board Ships applies to your hull at all. Resolution MSC.337(91) lists vessel types it does not apply to, and its cabin limit changes at 10,000 gross tonnage. Select your vessel type and tonnage to see which applies.

Vessel inputs

Reading the result correctly

What the limit is

The figures returned are the Chapter 4 limits for cabins and hospitals in the two tonnage bands: 60 dB(A) from 1,600 GT up to but not including 10,000 GT, and 55 dB(A) at 10,000 GT and above. Limits for machinery spaces, workshops, the navigating bridge and other spaces are in the same chapter of the resolution and are outside what this checker covers.

What an excluded vessel type means

If the Code does not apply, the limits above are not a flag-state obligation on that hull. Any acoustic target in the specification is then coming from the owner or from a class comfort notation, and it is worth finding out which before pricing a floor against it.

What the comparison is and is not

Where you enter measured levels, the tool energy-averages the figures you typed and subtracts the band limit. That is arithmetic on your own numbers. Compliance under the Code is established by a noise survey carried out to its measurement procedure and written up in a noise survey report, so an "inside by" result here is an early indication, not a determination.

Why the floor alone does not answer it

A build-up’s Rw is a laboratory airborne index for the assembly. The level a cabin reaches also depends on compartment layout, machinery isolation and ventilation terminals. This checker names the build-up whose Rw is closest to the value you enter; it does not claim that build-up will deliver the limit on its own.