Just-In-Time Arrival - Economic Speed
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.
Required JIT speed
12.00kn
FOC if full-speed + wait
75.0t
FOC if JIT arrival
55.1t
Bunker savings
12,337USD
Formula, assumptions, and limits
Cubic law (n=3) applies to propeller-limited MCR region; real behaviour approaches n=4 near MCR. JIT ignored port-anchor auxiliary load (typ. 2–4 t/day).
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Required JIT speed | kn | distance ÷ time | |
| Design/current speed | kn | voyage plan | |
| Speed-fuel exponent | - | hull performance curve | |
| Voyage duration at JIT | h | ETA from port |