Using your gps location, Wind Vane accesses the closest U.S. weather station to provide accurate, real-time wind direction and speed. Wind Vane can display the wind speed in miles per hour, knots, or kilometers per hour. This application also has a built in compass so you can see the wind direction relative to true or magnetic North. Why choose Wind Vane? We set out to make the most accurate wi... Read Morend gauge on the market. We thought about sound algorithms with the microphone but determined weather station data is more accurate and is trusted throughout the weather community nationwide. In addition, we can display the direction the wind is coming from creating additional value for our clients. After all, what good is speed without direction? This application will work on an iPhone 3GS and later as it requires a compass. Internet connectivity is needed to display the wind.