Voyage Summary

Eastbound tanker voyage from Tubarão to Port Louis, 20 days, 5,514 nm – across the South Atlantic, round the Cape of Good Hope, across the southern Indian Ocean. September 2023. The lane runs entirely through the Southern Ocean's high-sea-state corridor; the historical replay spent 100% of the voyage at Sea State 4+ and 13.7% at Sea State 6+ (≥4 m), with a 6.09 m peak just south-west of the Cape. The optimized track cut Sea State 6+ exposure to 1.3%, a 10% reduction, and Sea State 5+ exposure from 62.4% to 40.9%. Peak wave encounter dropped from 6.09 m to 4.29 m, and the peak itself relocated: from the Cape's stormiest zone to a milder corridor south-east of Madagascar. Mean SOG 11.6 kn. The result was a 14.34% FOC saving (84 MT), outside any ECA, so a clean routing-and-weather management saving rather than a fuel-grade effect.