True vs True Wind

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.

True Wind is a clean sailing companion that makes wind direction, wind speed, and points of sail easy to understand. Designed for sailors learning the basics or refining technique, True Wind shows real-time wind direction and sail angles relative to your heading. Instantly recognize close-hauled, beam reach, broad reach, running, tacking, and gybing with a clear visual wind display. Whether you’re learning how to sail or want a simple wind compass for your sailboat, True Wind helps you understand wind angle and boat orientation at a glance. Features • Real-time wind direction and wind speed • Clear points-of-sail visualization • Haptic feedback for all points of sail • Spoken alerts for current sail position • Manual wind direction setup for offline use • Wind change notifications (15-minute and 1-hour alerts) • Night mode with red display for night sailing • Multiple appearance modes • Metric, nautical, and imperial units • Optional sail position labels • Apple Watch support for hands-free wind awareness True Wind is intended for educational and recreational use. Always rely on proper marine navigation equipment when required. Understand the wind. Sail with confidence.