Voyage Summary

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 realized entirely on ECA-grade fuel. Conditions were uniformly rough – the historical track ran at 100% Sea State 4+ across the full crossing, so the optimizer 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.