1) True Course (TC): This is the course measured from your navigation plotter when you plot your flight on your map.
2) True Heading (TH): Now that you have a true course, we need to correct for winds which will give us a true heading.
3) Magnetic Heading (MH): The difference between true north and magnetic north is known as variation. By adding or subtracting variation from your true heading you will get your magnetic heading
4) Compass Heading (CH): Items from inside the airplane can actually affect the performance of the compass. These errors are referred to as deviation.
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