RMI
Radio Magnetic Indicator (RMI)
The radio magnetic indicator (RMI) was developed to save space in the
instrument panel and to consolidate information into a single instrument in an
easy-to-mount location.
The RMI is a single instrument that provides combined indications from a
magnetic compass, VOR, and ADF. The RMI's azimuth card is spun by a flux gate
compass that is positioned far away from the instrument panel. As a result, the
aircraft's magnetic heading is always displayed. Typically, the lubber line
serves as a marker.
RMI the three in one instrument
A radio magnetic indicator (RMI) provides all indications of a magnetic
compass, VOR, and ADF in a single unit. At the top of the instrument dial,
there is a triangle. The solid pointer is driven by the VOR receiver to
indicate the magnetic direction of a tuned VOR station. The double, or hollow
pointer, indicates the magnetic bearing to the NDB when the ADF is tuned to an
NDB.
Pilot workload decreased
Pilot workload is decreased because the flux gate compass continuously
adjusts the azimuth card such that the aeroplane heading is at the top of the
instrument. The pointers indicate the location of the VOR and ADF transmission
stations in respect to the present position of the aircraft. For navigation
involving two of one type of station and none of the other, push buttons allow
conversion of either pointer to ADF or VOR.
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