How must the turbometer be positioned in relation to the wind?

The turbometer must be positioned at a specific angle to accurately measure wind direction and speed. Positioning it at 20 degrees of the wind line allows for a more precise reading of the wind's characteristics, as this angle helps mitigate interference from turbulence and other factors that could distort measurements. This method ensures that the device captures the most relevant aspects of the wind's flow, providing reliable data essential for jump planning and execution.

Having the turbometer directly face the wind line or at a 30-degree angle might not yield optimal accuracy, as these positions could introduce measurement errors. Similarly, positioning it parallel to the wind line would not effectively register the wind's impact, making it less effective for the intended purpose of measuring airborne conditions. Thus, the correct angle helps ensure that the readings are reflective of actual conditions, thus facilitating successful jump operations.