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.

JITSpeedDecarb

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{FOC}_{JIT} = \text{FOC}_0 \cdot \left(\frac{v_{JIT}}{v_0}\right)^n \cdot \frac{t}{24}

Symbol	Meaning	Unit
$v_{JIT}$	Required JIT speed	kn
$v_0$	Design/current speed	kn
$n$	Speed-fuel exponent
$t$	Voyage duration at JIT	h

Source: IMO MEPC.323(74) - JIT arrival; GreenVoyage2050 JIT guidelines

In short

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.