Yachts 30–180 m. Outside CII scope but increasingly audited by owners and charterers against a CO₂-per-day or per-guest-night intensity.
Formula
$$ \text{CO}2^\text{year} = \sum_j F_j \cdot C{f,j} $$
$$ \text{Intensity} = \frac{\text{CO}2^\text{year}}{d\text{run}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F_j$ | Mass of fuel $j$ | t | bunker log |
| $C_{f,j}$ | CO₂ factor | t CO₂ / t fuel | MEPC.364(79) |
| $Bench (Running days / year)$ | operational benchmark | d | operations log |
| $d_\text{op}$ | Operating days | d | operations log |
SYBAss ‘YETI’ (Yacht Environmental Transparency Index) scores 100+ metre yachts on five metrics including running fuel intensity. Top-decile achieves ~ 12–18 t CO₂ per running day; fleet median 25–40 t.
Sources
- SYBAss YETI - Yacht Environmental Transparency Index.
- IMO MEPC.364(79) - Cf conversion factors.