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A
requires no power from the aircraft systems to indicate direction.
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B
is free from interference from other aircraft systems and components.
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C
is only certified for use under VFR and during published hours of daylight.
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D
is more reliable than a directional gyro during turns and periods of acceleration or deceleration.
- The compass is ineffective near the poles. As you approach the poles, the angle between magnetic flux and the horizon becomes vertical – compass ‘dip’ becomes a factor => decrease in the horizontal magnetic field, increase in the vertical magnetic field.
- The value of the horizontal component is maximum at the Magnetic Equator, a freely suspended compass needle in the Earth's magnetic field will be horizontal to the Earth - in line with the horizontal component.
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