True vs VoyLog

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.

VoyLog is the fastest way for ship captains and officers to create professional voyage log emails. Fill a simple form with position, time, bunkers, cargo, drafts and ETA — and VoyLog builds a clean, office-ready report you can send from your own mail app in seconds. No typing long reports, no formatting mistakes. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://trmyindustry.com/voylog-privacy.html FEATURES • Create a complete voyage report in about 30 seconds • Auto-fill your vessel's position with GPS • Track positions, routes, fuel, cargo, drafts and ETAs • The Lane: follow your vessels on a live marine map, built from the reports you send • Analytics: turn your reports into voyage insights, all in one place • Clean, professional emails ready to send VoyLog is completely free to use. Upgrade to VoyLog Pro for advanced analytics and more.