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Set & Drift - Current Triangle

Resolve set and drift of a current into along-track and across-track components for leeway compensation - the classical vector triangle.

CurrentSetDrift
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Formula, assumptions, and limits

valong=Dcos(SC),vcross=Dsin(SC)v_{along} = D \cos(S - C), \quad v_{cross} = D \sin(S - C)
SymbolMeaningUnit
SSCurrent set (toward)°T
DDDrift speedkn
CCCourse over ground°T

Source: Bowditch Pub.9 Ch.7

In short

Resolve set and drift of a current into along-track and across-track components for leeway compensation - the classical vector triangle.

Learn the theory Marine Voyage Planning and Routing