For App Developers

The SailTimer API is available free on iOS and Android, delivering two types of data to your app:

1. Connects the wireless SailTimer Wind Instrumentâ„¢ to your app.  You don't have to learn how to parse the Bluetooth 4 packets, or have to work out a lot of calculations from magnetic to true wind direction, and apparent to true wind.  The API receives the Bluetooth data and reassembles it into NMEA 0183 text for you. 

The API displays battery power and signal strength to help the user to make the wireless connection.  The API does not display the wind speed or direction though;  that is where your app comes in.  The API is like a mini-app, with a very minimal interface.  It is intended to run quietly in the background, so that the user can view wind data in your app. 

The API sends Apparent Wind Speed and Direction to your app.  It  also uses Location Services (the GPS) in the mobile device to convert from Apparent to True for the MWD sentence in NMEA 0183 format.  The Android version of the API also sends the MWV sentence for wind angle.  Full details are provided in the README.txt file that comes with the sample code.

2. Chart overlay from, showing live wind conditions and GPS tracks being crowdsourced worldwide.  Replays of events such as races and GPS tracks from a sailing trip can also be replayed in the cloud overlay.  All of your app users can contribute, whether they have a wireless Wind Instrument or not. 

Android and iOS

For iOS app developers, the "SailTimerClient" is a working reference app which receives data from the API and displays it in a similar fashion. Data is sent from the API to your app on a port number using UDP. 

For Android apps, the SailTimer API on Android shares data via broadcasted Intents (not via a UDP or TCP/IP port).

On both platforms, there is also a simulation that generates sample data for testing as if a Wind Instrument was connected. 

We can also provide ongoing incentives and promotion for participating apps.  Please email for details on how to connect. 


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