# VOR Cross-track Distance RNAV

This is an $RA=60D$ question, with $R$ being your range from the beacon, $A$ the angle between your selected track and your QDMQDM —Magnetic bearing from an aircraft to a beacon or station, and $D$ being your cross track distance.

Firstly, rearrange to get $D = \frac{RA}{60}$.The variable $A$ 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.