VOR Trainer > Combined RBI/RMI
VOR Trainer's left-hand instrument can be selected to function either as an RBI (Relative Bearing Indicator) or as an RMI (Radio Magnetic Indicator).
An RBI has a fixed compass card (that does not rotate) and therefore the pointer indicates a relative bearing to the VOR beacon.
An RMI (Radio Magnetic Indicator) displays aircraft heading and magnetic bearing to the VOR beacon. Bearing is indicated by the pointer whilst magnetic heading is indicated by a rotating compass card registering against a fixed lubber mark at the top of the display.