As I'm the only one to have used the term QDM, I guess that last remark was aimed at me? I agree that a QDM is a magnetic track to a station, just as a QDR is the track from one. Generally when using NDBs one is aiming to achieve a desired QDM/QDR as generally we use a magnetic compass to navigate with and approach plates depict magnetic tracks to fly procedures. Did I miss something?
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Another day in paradise