Apparent Wind Calculator
Calculate the apparent wind.
Only for iPhone
$0.99 · Designed for iPhone. Not verified for macOS.
iPhone
Know your apparent wind before you leave the dock. Built by sailors, for sailors.
Apparent Wind Calculator takes the maths out of one of sailing's most important concepts. Feed in your true wind angle, true wind speed, and boat speed — and instantly see your apparent wind angle and speed, visualised as a live vector diagram.
Whether passage planning, under sail or just getting your head around why the wind always seems to come from forward when you bear away, this app makes it immediately clear.
BOAT POLAR
Load a polar table and the app sets your boat speed automatically based on your true wind angle and wind speed. Built-in presets cover small, medium, and large monohulls and catamarans — or enter your own target speeds for a custom polar. With auto-fill enabled, every diagram you see reflects realistic performance numbers for your boat, not a guess.
FEATURES
• Live vector diagram showing true wind, apparent wind, and boat velocity as scaled arrows — updates in real time as you move the sliders
• Monohull and catamaran boat graphics that respond to your apparent wind angle
• Boat polar table with presets for monohulls and catamarans, fully editable
• Auto-fill boat speed from your polar for realistic results
• Point of sail readout — from Close Hauled to Deep Run
• Port and starboard tack display
• Works entirely offline, no account required
WHO IT'S FOR
Sailing students learning the theory, racers checking their VMG angles, cruisers planning passages, and coaches explaining wind shifts to crew.
The apparent wind is what your sails actually feel. This app helps you understand it.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Adam Harvey, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Adam Harvey
- Size
- 25.4 MB
- Category
- Navigation
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Latitude 49
