Expert acoustic analysis and compliance

Underwater radiated noise is increasingly recognised as a critical environmental challenge in shipping. For operators, it presents both a compliance risk and a commercial opportunity.

An Underwater Radiated Noise (URN) notation is a voluntary classification that certifies a ship meets specific, quiet-running standards. Its primary benefits include protecting marine ecosystems, unlocking port fee discounts, and enhancing crew wellbeing.

LR provides a structured approach to URN measurement:

• Full-scale measurement at sea for vessels calling at Halifax, Nova Scotia
• Use of permanent acoustic array systems located in the harbour approach so there is no disruption to normal vessel operation
• Application of multiple validated methodologies to improve understanding of noise profiles

This unique capability allows for consistent, repeatable and high-quality measurement in a real operating environment and provides an independent verification of performance, supporting both external reporting and stakeholder confidence.

Partner with LR advisory expertise

Stay ahead of the curve with our guidance on navigating these regulatory changes and optimizing your URN management strategies. Our experience in underwater noise measurement has been gained working closely with navies around the world to help them ensure that their vessels meet stringent noise guidelines. This has also provided us with direct access to 'one of a kind' proven facilities and equipment that we are now able to make available to commercial operators, too.

• URN Management Plan Development
• Vessel’s URN Predictions
• Energy Efficiency & URN Relationships
• Environmental Impact at Specific Locations
• Field Measurements
• Rotor-Hull Interaction
• URN Mitigation Advisory

Fleet Benefits

• Increased efficiency
• Environmental protection
• Decreased onboard noise level
• Decreased material damage