Norway-to-UK tanker shuttle from Sture to Tetney Terminal – 35 hours, 438 nm, southwest across the central North Sea, May 2019. The entire crossing sits inside the North Sea SECA, so the 6.0 MT saving was realised entirely on ECA-grade fuel. Conditions were uniformly rough – the historical track ran at 100% Sea State 4+ across the full crossing, so the optimiser couldn't route around weather, and the 2.95% distance and 2.97% duration reduction came from finding a more efficient corridor through it rather than from sea-state avoidance. Mean SOG 12.37 kn.
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 14.51% reduction is the delta sailed at the same speed band, under the same wind and wave conditions.
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