Wind Correction Angle: Essential for Flight Planning

The Challenge of Aerial Navigation

Unlike driving a car on a road, flying an airplane involves moving through a fluid mass that is itself moving. This moving air mass is the wind. If you point your nose directly at your destination but a crosswind is blowing, you will drift off course. The angle you must crab into the wind to maintain your desired path over the ground is the Wind Correction Angle (WCA).

True Course vs. True Heading

Your True Course (TC) is the line drawn on the map—the actual geographic path you want to fly. Your True Heading (TH) is the direction the nose of the airplane points. TH is equal to TC plus or minus the WCA.

If the wind is coming from the left, you must subtract the WCA from your course (steer left). If the wind is from the right, you add the WCA (steer right).

Calculating the WCA

To calculate the WCA, you need to know your True Airspeed (TAS), your desired True Course, the wind direction, and the wind speed. This calculation solves a geometric vector problem known as the wind triangle.

Historically, pilots used a mechanical E6B flight computer to visualize this triangle and find the WCA. Today, digital calculators use trigonometry to provide instantaneous and precise WCA and Ground Speed outputs.

Practical Application

Winds aloft forecasts are critical for this calculation. Remember that winds aloft are given in True direction, which makes them easy to apply to your True Course. Once you find your True Heading, you will apply local magnetic variation to find your Magnetic Heading, which is what you actually steer on your compass.