Weather Routing Savings

Optimised track selection through varying wind/wave/current fields instead of rhumb-line or great-circle. Fleet-average savings 2–5 % on trans-ocean legs; higher on wind-driven trades like North Atlantic or South Pacific crossings.

OpsWeather

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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

F_\text{routed} = F_\text{base} \cdot (1 - p_\text{save}) \cdot (1 + p_\text{extra})

Symbol	Meaning	Unit
$F_\text{base}$	Fuel on the rhumb/great-circle route at reference speed	t
$F_\text{routed}$	Fuel on the optimised route	t
$p_\text{save}$	Fractional fuel reduction from avoiding weather	fraction
$p_\text{extra}$	Fractional extra distance accepted	fraction

Source: StormGeo - *Ship Routing Services*; ECMWF - high-resolution atmospheric model; IMO Resolution MEPC.282(70) - SEEMP weather-routing guidance

In short

Net fuel and CO₂ saving from weather-routed tracks, accounting for extra distance accepted to avoid adverse weather.

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