True-Wind Calculator
No in-app products collected for this app.
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Description
The wind you feel on a moving boat isn't the real wind. True-Wind Calculator turns the apparent wind you measure into the true wind you need — in two taps, no wind instruments required.
In use since 2013, completely rebuilt in 2026.
HOW IT WORKS
Enter boat speed, apparent wind speed, apparent wind angle and heading. The app does exact vector math — no lookup tables, no approximations — and gives you true wind speed and true wind direction instantly. Boat speed and heading can be filled automatically from GPS and compass with one tap.
FREE
True wind speed, direction and angle — unlimited calculations
One-tap GPS fill for boat speed and heading
The formula explained, so you can trust the numbers
Works completely offline — no account, no ads, no tracking
PRO (one-time purchase, no subscription)
Performance — live VMG, target boat speed, % of target VMG and point of sail, driven by your boat's polar
Tactics — tack preview, windward-mark laylines, and whether you can lay the mark
Boat polars — pick a preset or build your own in the editor
Compass rose view — heading, apparent and true wind on one dial
Calculation history — every result logged with its inputs
All speed units — knots, m/s, km/h, mph
Bought the app back when it was paid? Pro is already yours — it unlocks automatically.
PRIVACY
Everything stays on your device. Location is read only to fill the input fields and never leaves your phone. No analytics, no third-party SDKs.