> For the complete documentation index, see [llms.txt](https://docs.estela.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.estela.co/using-the-estela-mobile-app/broadcasting-wind-data.md).

# Broadcasting Wind Data

The eStela Mobile App can connect to Bluetooth Low Energy (BLE) anemometers to transmit real-time wind data during a tracking session.

This functionality provides the system with accurate wind information, improving: 

* Visualization (e.g., laylines and wind overlays) 
* Real-time classification precision 
* Post-race performance analysis

### How It Works

When connected, the app transmits live wind readings that are automatically linked to the active tracking session.

Each wind data point includes:  Timestamp, Latitude and longitude, Wind speed, Wind direction

These records are stored by eStela and used for accurate race insights and playback.

### Connecting an Anemometer

To connect a BLE anemometer: 

1. Open the eStela Mobile App 
2. Start tracking your session 
3. Tap the Bluetooth icon on the screen 
4. Follow the connection steps displayed in the app

Once paired, the app will automatically begin transmitting wind data to eStela.

### Supported Devices

Currently supported BLE anemometers are available from: [🔗 Calypso Instruments](https://calypsoinstruments.com/)

If you’d like to integrate another Bluetooth Low Energy (BLE) anemometer, please [contact us](/troubleshooting-and-support/contacting-support.md) — we’re happy to collaborate on adding compatibility.