Maritime Glossary
Source-cited definitions for shipping, engineering, navigation, and regulatory terminology. Confidence-scored and verified against primary IMO, IHO, and industry sources.
- Electronic Chart Display and Information SystemECDIS
- An approved navigation system displaying official electronic charts integrated with GPS, radar, and AIS for passage planning and monitoring.
- navigationtechnologyregulationhigh confidence
- Emergency Position-Indicating Radio BeaconEPIRB
- A satellite-linked distress beacon that activates on immersion and transmits the vessel's position to rescue services via the Cospas-Sarsat system.
- safetynavigationregulationhigh confidence
- Emission Control AreaECA · SECA · NECA
- A sea area where stricter limits on SOx, NOx, and particulate matter emissions from ships apply under MARPOL Annex VI.
- regulationenvironmentdecarbonizationhigh confidence
- Energy Efficiency Design IndexEEDI
- An IMO design-based index measuring CO₂ efficiency of a new ship, expressed in grams of CO₂ per tonne-mile.
- decarbonizationregulationenergy-efficiencyhigh confidence
- Energy Efficiency Existing Ship IndexEEXI
- A one-time technical efficiency standard for existing ships under MARPOL Annex VI, in force from November 2022.
- decarbonizationregulationenergy-efficiencyhigh confidence
- Exhaust Gas Cleaning SystemEGCS · scrubber · open-loop scrubber · closed-loop scrubber · hybrid scrubber
- A shipboard system that removes sulphur oxides from engine exhaust gas, enabling compliance with MARPOL Annex VI sulphur limits while burning HFO.
- engineeringenvironmentdecarbonizationhigh confidence