VOR Cross-track Distance RNAV
This is an question, with being your range from the beacon, the angle between your selected track and your QDMQDM —Magnetic bearing from an aircraft to a beacon or station, and being your cross track distance.
Firstly, rearrange to get .The variable can be calculated by taking the difference between QDMQDM —Magnetic bearing from an aircraft to a beacon or station and selected track, or read directly from the CDICDI —Course Deviation Indicator.
Remember, each dot is 2° on a 5 dot instrument and 5° on a 2 dot instrument. Helpfully, you do not have to worry about left or right sensing here; the cross track distance will be the same (though on opposite sides) irrespective of whether you are 5° left or right of the selected track. As ever, watch out for the examiner giving question data or answers in units other than nm.
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