Relative Bearing Indicator (RBI)
The Relative Bearing Indicator (RBI), also known as the fixed-card ADF, is an instrument used in aircraft navigation that shows the relative bearing to a station. The RBI is designed to provide pilots with a visual representation of the angle between their current position and a specific navigational aid.
The RBI is characterized by a fixed card that displays the magnetic compass heading and a needle that is overlaid on top of it. The needle indicates the relative bearing to a station, which is always shown at the top of the instrument as zero. The pilot uses this information to determine the direction in which the aircraft should fly to reach the selected station.
The RBI is an important tool for pilots, particularly when navigating under Instrument Flight Rules (IFR) or poor visual conditions. It allows pilots to establish a clear line of sight between their current position and the selected station, providing accurate directional information for the duration of the flight. By interpreting the information displayed on the RBI, the pilot can make critical decisions about the flight path, altitude, and airspeed to ensure safe and efficient navigation.
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