Q Code

Question 1

Given : Compass heading 270° Deviation 2°W Variation 30°E Relative bearing 316° What is the QDR?

Answer 1

QDR is the magnetic bearing FROM the STATION TO the AIRCRAFT. Compass Deviation Magnetic Variation True (CDMVT) - Deviation West Compass Best/Deviation East Compass Least. Variation West Magnetic Best/Deviation East Magnetic Least. Therefore: 270 (C) - 2 W (D) = 268 (M)….268 (M) is the aircraft heading. The relative bearing of the aircraft from the station is 316 degrees. i.e. the bearing of the station is 44 degrees (360 - 316 deg = 44 deg) to the left of the aircraft nose (i.e. the aircraft heading). Therefore the bearing FROM the AIRCRAFT TO the STATION (QDM) = 268 (M) - 44 deg = 224 degrees (M). QDR = QDM +/- 180. So we can determine QDR, which is 224 - 180 - 044 degrees