SEA Index®,
the environmental benchmark
to improve yacht environmental performance
The SEA Index® Methodology
A Scientific Approach to Sustainable Yachting.
Designed for modern yachting, the SEA Index® toolkit recognizes sustainable excellence and delivers actionable insights for hybrid, and next generation fuel‑cell propulsion systems, helping owners lead the shift toward cleaner, future‑ready navigation.
Excellent
Superior
Standard
Fair
Unoptimized
Your rating is calculated relative to emission thresholds;
the more efficient your vessel’s profile, the higher its SEA Index® rate.
The SEA Index® flagship CO₂ certification provides a clear, reliable view of your yacht’s environmental performance using IMO‑aligned EEDI/EEXI principles and benchmarking against a fleet of 800+ yachts. Now enhanced with our new Air Quality Certification developed with AtmoSud, using AIS data from 2,000 yachts over 24 metres, the SEA Index® toolkit assesses both CO₂ output and key pollutants (NOx and PM) for a broader greenhouse gas picture of your vessel’s impact.
SEA Index
(—)50%
Excellent
(—)25%
Superior
Reference
Standard
(+)25%
Fair
(+)50%
Unoptimized
Now enhanced with our new Air Quality Certification developed with AtmoSud, using AIS data from 2,000 yachts over 24 metres, the SEA Index® toolkit assesses both CO₂ output and key pollutants (NOx and PM) for a broader greenhouse gas picture of your vessel’s impact.
SEA Index
(—)50%
Excellent
(—)25%
Superior
Reference
Standard
(+)25%
Fair
(+)50%
Unoptimized
Certifications designed
for all yachting stakeholders
Built on internationally recognised, International Maritime Organisation’s standards (EEDI, EEXI)
Yacht Owner
& Captain
Port, Marina
& Mooring buoy
Yachting industry stakeholders
SEA Index® Certifications
3 certifications to measure your vessel’s impact
Carbon Emissions Certification
Our flagship leading tool for measuring and enhancing your yacht’s carbon footprint.
Included
Carbone CO₂ Emissions
In addition
Fuel consumption
& CO₂ emissions rating
Included
Ratio Fuel / CO₂
new
Air Quality
Certification
Master your vessel’s atmospheric profile to ensure seamless access to the world’s most protected navigation zones.
Included
Nitrogen monoxide (NO_x) Fine particulate matter
coming soon
Underwater Radiated Noise Certification
Minimize your vessel’s acoustic footprint with the knowledge your yacht is not contributing to biodiversity depletion
Included
Nitrogen monoxide (NO_x)
Fine particulate matter
how to EARN your certifications ?
A clear, guided and confidential process
STEP 1
Complete the online assessment using the SEA Index® tool
STEP 2
Submit a certification request by providing your vessel’s technical data
STEP 3
Issuance of the official SEA Index® certificate(s)
