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A remote reading compass uses a remote detector to determine the heading to be shown on the compass indicator on the pilot's instrument panel. The detector will be a Flux Detector/or flux gate and consists of a pendulous set of 4 coils aranged on a three leg "spider" One of the coils is the excitation coil supplied with 26V 400 HZ AC while the other three have an induced ac voltage from the excitation. Depending where they lie realative to the earth's magnetic field their output voltage will be either assisted or hindered and there will be an electric field created in the the three output wires which can drive an indicator to display the aircraft magnetic heading . These Indicators will be usually a HSI ( Horrizontal Situation Indicator) PNI ( Pictorial Navigation Indicator) or RMI (Radio Magnetic Indicator) Usually the output signal from the Flux detector is so small that an amplifier is needed to boost the signel to the Indicator. This system is usually GYRO STADILISED ( Directional Gyro) to make it display accurately in turns and to make it wander less. If it is not fitted with a gyro then the system is called a NON GYRO STABILISED REMOTE READING COMPASS system. It still workes but the display is more inclined to wander.

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