cgDIST - CO₂ per gross-tonnage nautical mile
Compute cgDIST - the operational CO₂ intensity metric used by ro-pax, ro-ro vehicle carriers, and cruise ships, where gross tonnage is a better capacity basis than deadweight.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Gross-tonnage-normalised CO₂ intensity | g CO₂ / (GT·nm) | |
| Mass of fuel burned | t | |
| CO₂ conversion factor for fuel | t CO₂ / t fuel | |
| Gross tonnage | ||
| Distance sailed in the reporting period | nm | |
| Unit conversion tonnes → grams |
Source: IMO MEPC.336(76) - operational CII guidelines; IMO MEPC.337(76) - reference lines (GT-based rows for passenger and ro-ro types); IMO MEPC.364(79) - Cf conversion factors
In short
Compute cgDIST for ro-pax, ro-ro vehicle carriers, and cruise ships - the operational carbon intensity metric based on gross tonnage per MEPC.337(76).