# True Wind

> Nautical tool for calculating true wind, sea state, and wave height. (iPhone/iPad app by SHIPPING TECHNOLOGIES LTD.)

- Source: https://appshunter.io/ios/app/true-wind/id1099191626 (this page in markdown: same URL + `.md`)
- Developer: [SHIPPING TECHNOLOGIES LTD](https://appshunter.io/developer/1099191625)
- Category: Navigation, Weather
- Price: $4.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 6.0 · 6 MB
- Languages: English
- Released: 2016-04-08
- Data updated: 2026-06-25
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/true-wind/id1099191626/reviews.md

## What is True Wind?

This True Wind and Sea state calculator determines the true wind speed, true wind direction and corresponding Beaufort force, sea state and wave height, based on the ship’s heading, ships speed, relative wind direction and relative wind speed. 

This is a useful App for mariners/sailors, shore based ship management companies or people interested in nautical science, that need to understand the effect of wind on sea states and determine the true wind direction and speed due to the relative motion of the ship.

This calculation normally involves calculating vector forces using some stationary and can be a bit time consuming. The App is user friendly and has jog dials that can be moved around smoothly to set the direction. The results are depicted in a fraction of a second saving time, and instead of opening a book to get the corresponding Beaufort force, sea states, compass points or wave heights – This App saves you all that trouble.

The inputs are:
Ship’s speed in nautical miles per hour (knots) or meters/sec (m/s).
Ship’s direction from zero to 360 degrees on compass.
Relative wind direction as displayed on a standard shipboard anemometer from zero to 180 degrees port or starboard (stbd).
Relative wind speed in nautical miles per hour (knots) or meters/sec (m/s).

 The following results are displayed after pressing the calculate button:
True wind speed in nautical miles per hour (knots) or meters/sec (m/s).
True wind direction from zero to 360 degrees on compass.
True wind direction in terms of compass points
Corresponding Beaufort force and description
Corresponding Sea state description and code
Probable wave height for the corresponding true wind speed.
A photograph of what the sea state may look like.

Developer: Captain Darren D’Souza – Master Mariner

## Key features

- True wind speed and direction calculation
- Beaufort force and sea state determination
- Wave height estimation
- Compass point display
- User-friendly jog dials for input
- Instantaneous results


## Frequently asked questions about True Wind

### What is True Wind used for?

True Wind calculates true wind speed, direction, Beaufort force, sea state, and wave height. It helps mariners understand the effect of wind on sea conditions and the true wind due to ship motion.

### What information does True Wind require for calculations?

True Wind requires the ship's speed (knots or m/s), ship's direction (0-360 degrees), relative wind direction (0-180 degrees port or starboard), and relative wind speed (knots or m/s).

### What are the results provided by True Wind?

Results include true wind speed and direction (in knots/m/s and compass points), Beaufort force, sea state description and code, and probable wave height. It also shows a photograph of the potential sea state.

### How does True Wind compare to manual calculations?

This app provides results in a fraction of a second, saving time compared to manual vector force calculations or consulting reference books for Beaufort force and sea states.

### What devices does True Wind support?

True Wind is available for iPhone and iPod devices.

### What is the age rating for True Wind?

True Wind has an age rating of 4+, making it suitable for a wide range of users.

### When was True Wind last updated?

True Wind was last updated on April 8, 2016, with version 1.0.

### What is the price of True Wind?

True Wind is a paid application, priced at $4.99.

## Version history (last 1 release)

### 1.0 — 2016-04-08

This app has been updated by Apple to display the Apple Watch app icon.

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## More apps by SHIPPING TECHNOLOGIES LTD

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- [Ship Squat Calculator](https://appshunter.io/ios/app/ship-squat-calculator/id1362778887)
- [Ship Channel Configurator](https://appshunter.io/ios/app/ship-channel-configurator/id1448509860)
- [LNG Densities and Energy calc](https://appshunter.io/ios/app/lng-densities-and-energy-calc/id1483234859)

All apps by SHIPPING TECHNOLOGIES LTD: https://appshunter.io/developer/1099191625

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*