Heading indicators, also known as directional gyros or gyrocompasses, are flight instruments that display aircraft magnetic or true heading by reference to a gyroscopic or solid-state sensing element, covering mechanical gyro assemblies, flux valve-slaved systems, ring laser gyro (RLG) and micro-electromechanical systems (MEMS) technologies, along with associated synchro transmission, servo-driven dial mechanisms, and digital heading output interfaces.
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