India-to-Brazil tanker voyage from Gujarat to Rio de Janeiro, 25 days westbound across the Indian Ocean, around the Cape of Good Hope, and across the South Atlantic, October–November 2023. The route-averaged significant wave height was 1.95 m on the optimised track. The highest seas of the voyage came late, on the Brazilian approach at 24.2°S, 34.3°W: the optimised track encountered a peak of 5.96 m versus 5.64 m on the historical track – a marginally higher absolute peak in exchange for reduced overall heavy-weather dwell time, with Sea State 5+ waypoints cut from 26.1% to 23.4%. The lane runs entirely outside ECA zones, so VLSFO was held throughout with no fuel-switching event, and the 0.94% FOC savings (5.9 MT) is a pure routing result rather than a fuel-grade arbitrage.
How the voyage performed across wave height and Douglas Sea State exposure — recorded waypoint-by-waypoint.
Waypoint-by-waypoint against the historical AIS baseline.
The historical AIS track was pulled from public records and matched against the master’s own reports. The VF Engine then re-routed the same vessel under the weather as it actually occurred — not a forecast. Both tracks were scored by the same FOC prediction model and compared waypoint by waypoint. The 0.94% reduction is the delta sailed at the same speed band, under the same wind and wave conditions.
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