Course-to-steer and speed-over-ground when a tidal stream sets across the track. Vector triangle closure.
Formula
$$ \vec V_\text{ground} = \vec V_\text{water} + \vec V_\text{current} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $CMG$ | Course made good (track) | °T | input |
| $STW$ | Speed through water | kn | log |
| $Set$ | Current direction (towards) | °T | tidal stream atlas |
| $Drift$ | Current rate | kn | tidal stream atlas |
| $CTS$ | Course to steer | °T | result |
| $SOG$ | Speed over ground | kn | result |
Sources
- Admiralty Manual of Navigation BR45 Ch.8.