Radio Magnetic Indicator (RMI) Overview

RMI radio magnetic indicator image download

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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