What does RMI stand for in aviation navigation?

RMI stands for Radio Magnetic Indicator in aviation navigation. This instrument is crucial for pilots as it combines both radio navigation signals with a magnetic compass. The RMI displays the aircraft's heading relative to magnetic North while also showing the bearing to a selected navigational radio facility, such as a VOR or NDB. This dual functionality assists pilots in understanding their position relative to navigation aids, enhancing situational awareness during flight.

The integration of radio signals allows the RMI to provide real-time directional information that is particularly valuable in terms of course following and navigation, especially in conditions where visual references are limited. Understanding the operation and interpretation of an RMI is essential for effective navigation in both instrument and visual flight rules scenarios.