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A pilot has become disorientated due to vertigo, and loses situational awareness. They decide to ask ATC for a GDF fix, and the reply is "QDM 120°, Class Bravo". If both the aircraft and the ATC station are in an area where magnetic variation is 5°E, which of the following statements is correct?

  • A

    QDM is 120°, accuracy +/- 2°

  • B

    QDM is 125°, accuracy +/- 5°

  • C

    QDR is 305°, accuracy +/- 5°

  • D

    QDR is 300°, accuracy +/- 5°

Refer to figure.
This question has several elements to it.

1) QDM or QDR. QDM is the magnetic bearing to the station. QDR is the magnetic bearing from the station. QDM and QDR are generally reciprocals of each other. You have been given a QDM of 120°, so the QDR would be 300°.

2) Class of bearing. All bearings from ATC will be given with a Class - this tells you how accurate they are. Class A = accuracy +/- 2°, Class B = accuracy +/- 5°, Class C = accuracy +/- 10°, Class D = accuracy worse than Class C. Here you are given Class B, so the given bearing is accurate to +/- 5°.

3) Variation. This is only applied if you are converting between magnetic and true bearings. You do not need to do this in this question, so you can ignore the variation.

QDM is 120°, accuracy +/- 2° --> INCORRECT. Class B is accurate +/- 5°

QDM is 125°, accuracy +/- 5° --> INCORRECT. You do not need to apply variation

QDR is 305°, accuracy +/- 5° --> INCORRECT. You do not need to apply variation

QDR is 300°, accuracy +/- 5° --> CORRECT.

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