SEA CALCULATOR
True wind
True wind worksheet: heading, speed over ground, and apparent wind to true wind speed and direction.
Example values — edit any field; results update as you type.
Ship motion
°T
kn
Apparent wind
kn
°
Angle from bow; port vs starboard sets TWD convention.
Result
- TWS
- 10.6 kn
- TWA
- 86.7°
- TWD
- 86.7°T (E)
- Beaufort
- F4