Resolve set and drift of a current into along-track and across-track components for leeway compensation - the classical vector triangle.
Formula
$$ v_{along} = D \cos(S - C), \quad v_{cross} = D \sin(S - C) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $S$ | Current set (toward) | °T | chart / ECDIS |
| $D$ | Drift speed | kn | tide tables |
| $C$ | Course over ground | °T | GPS |
Sources
- Bowditch Pub.9 Ch.7.