Distance of centerline localizer and vor3/10/2024 ![]() ![]() When used with a GPS, or other RNAV equipment, it shows actual distance left or right of the programmed course line.(See Using a VOR for usage during flight.) Deflection is 10° deviation at full scale (each side), with each dot on the CDI representing 2°. This can be used to find and follow the desired radial. It then shows the number of degrees deviation between the aircraft's current position and the "radial" line emanating from the signal source at the given bearing. The course line is selected by turning an "omni bearing selector" or "OBS" knob usually located in the lower left of the indicator. When used with a VOR or VORTAC, the instrument can be referred to as an "omni bearing indicator" ("OBI").The deflection of the needle is proportional to the course deviation, but sensitivity and deflection vary depending on the system being used: Only the receiver's current position determines the reading: the aircraft's heading, orientation, and track are not indicated. The pilot then steers to stay on that line. Correction is made until the vertical needle centres, meaning the aircraft has intercepted the given course line. The indicator shows the direction to steer to correct for course deviations. If the location of the aircraft is to the left of this course, the needle deflects to the right, and vice versa. Avionics instrument A mechanical VOR displayĪ course deviation indicator ( CDI) is an avionics instrument used in aircraft navigation to determine an aircraft's lateral position in relation to a course to or from a radio navigation beacon. ![]()
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