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To calculate the QDR (magnetic bearing FROM the station) from an RBI reading:

Q: To calculate the QDR (magnetic bearing FROM the station) from an RBI reading:

QDR = MH + RB (the QDM) plus or minus 180. QDR = QDM +/- 180 degrees. First calculate QDM (MH + RB), then add or subtract 180 to get the reciprocal bearing FROM the station.

QDR = MH + RB + 180

QDR = RB - MH

QDR = MH + RB (the QDM) plus or minus 180

QDR = RB only

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