Refer to figure.
Given the following information and the indication shown on the fixed card ADF, what is the true bearing from the station to the aircraft?
Magnetic Variation: 3°W
Compass Deviation: 5°W
EASA LO 062.02.02.02.04: Calculate the true bearing from the compass heading and relative bearing.
Refer to figure.
The fixed card ADF has, as the same suggests, a fixed compass card. That is, it will always show "North" up. As such, it provides us with a relative bearing to the station. The question asks us about the true bearing from the station to the aircraft. So we should first convert our compass heading to a true heading, by applying variation and deviation. We can apply the memory aids:
- Deviation West, Compass Best
- Variation West, Magnetic Best
Reading the compass heading from the annex as 125°C:
- 125°C - 5°W deviation = 120°M
- 120°M - 3°W variation = 117°T
A QUJ is the code for the true bearing towards a station, whereas the QTE is the true bearing from the station, or the reciprocal of the QUJ. The relative bearing is read from the ADF, and is 270°, or we can also consider it to be -90°.
True Heading + Relative bearing = QUJ
QTE = QUJ +/- 180°
QUJ = 117 - 90 = 027°T
QTE = 027 + 180 = 207°T
So, the true heading from the station to the aircraft is 207°T.
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