Heading Indicator, sometimes called a directional gyro (DG) is a measure of the rotation by using the energy from the engine to recognize the yaw motion of the airplane in the vertical axis, the value displayed by the indicator will display the heading angle of 360 elements, sa. By this value to a value that indicate the direction the airplane is a number that is displayed on the heading indicator is displayed by cutting off zeros, i.e. number 6 refers to the 60 or 120 elements 12 elements, sa sa stands for, but because of the value represented by the heading indicator may be displaying an error, so we need to keep adjusting the display value of the heading indicator to match the magnetic compass.
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