Speed and fuel savings from slowing down to match a pilot-boarding slot instead of steaming full-speed then waiting at anchor - per IMO MEPC.323(74) GreenVoyage / JIT initiative.
Formula
$$ \text{FOC}_{JIT} = \text{FOC}0 \cdot \left(\frac{v{JIT}}{v_0}\right)^n \cdot \frac{t}{24} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $v_{JIT}$ | Required JIT speed | kn | distance รท time |
| $v_0$ | Design/current speed | kn | voyage plan |
| $n$ | Speed-fuel exponent | - | hull performance curve |
| $t$ | Voyage duration at JIT | h | ETA from port |
Sources
- IMO MEPC.323(74) - JIT arrival.
- GreenVoyage2050 JIT guidelines.