What is the regulation of underwater noise (SEL) in ocean freight?
Reduce Noise, Preserve Life, Stay Compliant.
Learn how global regulations on underwater Sound Exposure Level (SEL) are shaping ocean freight practices—and how your company can align with these evolving standards.
Marine species—especially whales, dolphins, and fish—depend on sound to survive. But as global shipping grows, so does noise pollution beneath the surface.
90% of world trade is moved by ship
Underwater noise from vessels disrupts migration, communication, and feeding
Engines, propellers, and sonar emit harmful frequencies across broad ranges
Underwater noise is now classified as marine pollution—and is regulated globally
What Is SEL & Why It's Regulated
Sound Exposure Level (SEL) measures the cumulative energy of sound received over time. It's used alongside Sound Pressure Level (SPL) to assess how ship noise impacts marine ecosystems.
Reduction and control of underwater noise
Harmonized international response for global sea lanes
Sound monitoring in compliance with SEL thresholds
Key Regulations to Know
Regulation / Guideline
Scope
Key Points
UNCLOS – Art. 194
Global
Calls for action to prevent marine pollution from any source—including acoustic pollution
IMO MEPC (2008–2022)
Maritime
Guidelines on commercial shipping noise & its marine impact; under review for updates
Marine Strategy Framework Directive (EU)
EU
Monitoring scheme for underwater noise levels
SOLAS & MLC
Onboard
Noise limits in working/living spaces to protect crew health
PSSA (Particularly Sensitive Sea Areas)
Regional
Zones with stricter acoustic limits (e.g. Great Barrier Reef, Florida Keys)
What's Required of Ocean Freight Operators?
Monitor and document underwater noise levels (SEL & SPL)
Adapt ship design & operations to reduce acoustic impact
Avoid high-sensitivity zones or comply with routing restrictions
Use certified tools & methodologies per IMO/ISO standards
How Sinay Helps You Stay Compliant
Sinay's Noise Monitoring Module offers a turnkey solution:
Data Collection
Broadband hydrophones + AIS integration = real-time SEL monitoring
Smart Processing
Machine learning filters noise sources and evaluates compliance
Clear Dashboards
Interactive reports + automated alerts to inform your decisions
Full Coverage
From baseline studies to route planning and sensitive zone management
Ready to reduce your acoustic footprint?
Let's future-proof your operations with real-time noise monitoring.
