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Radio Magnetic Indicator (RMI): An electronic navigation instrument that combines a magnetic compass card with two bearing pointers (typically). Generally, one pointer is for the ADF while the other is for an RNAV or VOR navigation system. The pointers are typically different colors and of different widths for ease of identification. Sometimes a function switch is provided to allow the #2 pointer to be slaved to either a VOR or RNAV system. The card of the RMI acts as a gyro-stabilized magnetic compass (usually corrected for north via a flx valve) and shows the magnetic heading the aircraft is flying.
source: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25A)
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