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Radio Magnetic Indicator (RMI)

 Radio Magnetic Indicator (RMI)

  • The RMI  a navigational aid providing aircraft magnetic or directional gyro heading and very high frequency omnidirectional range (VOR), GPS, and automatic direction finder (ADF) bearing information.
  • Remote indicating compasses were developed to compensate for errors in and limitations of older types of heading indicators.
  • A remote compass transmitter is a separate unit usually mounted in a wingtip to eliminate the possibility of magnetic interference.
  •  The RMI consists of a compass card, a heading index, two bearing pointers, and pointer function switches.
  • The two pointers are driven by any two combinations of a GPS, an ADF, and/or a VOR. The pilot has the ability to select the navigation aid to be indicated. The pointer indicates course to selected NAVAID or waypoint.
  • the green pointer is indicating the station tuned on the ADF. The yellow pointer is indicating the course to a VOR of GPS waypoint.
  •  Note that there is no requirement for a pilot to select course with the RMI, but only the NAVAID is to be indicated.

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