True vs Cruise Nav

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.

Ever wondered where you are at sea, how fast you’re going, how far until the next port of call, or how many hours remain on your journey? Cruise Nav gives you the answers—right from your phone. Key Features: • Works Offline: Uses GPS signals even in Airplane Mode to show your live position, speed, distance, and estimated time to destination. • Flexible Units: View distances in Kilometers or Nautical Miles. • Ports Worldwide: Search hundreds of ports, or add your own destination with a long press on the map. • Custom Routes: Draw your own route to get more accurate distance and time estimates. • Satellite & Map Views: See your trip your way, online or offline. Tips for Best Results: • GPS reception may be weaker inside the ship—try using the app near windows or out on deck. • For smooth offline use, open the app while still connected to the internet to cache map details. • Note: Continued GPS use can reduce battery life.