During a flight you become lost and so request a QDM from ATC. What type of message is this?
Refer to figure.
Learning Objective 090.01.01.04.01: Identify to which category of messages a type of message belongs and identify the associated priority indicator.
As seen in the figure there is a system of abbreviations that indicates what kind of bearing is described.
- QDM = Magnetic bearing to the station
- QDR = Magnetic bearing from the station
- QUJ = True bearing to the station
- QTE = True bearing from the station
Note: ICAO officially defines QDM/QDR = magnetic heading (zero wind).
ICAO Annex 10
Volume II
5.1.8 Categories of messages
The categories of messages handled by the aeronautical mobile service and the order of priority in the establishment of communications and the transmission of messages shall be in according with the following table.
| Message category and order of priority | |
| a) | Distress calls, distress messages and distress traffic = MAYDAY calls |
| b) | Urgency messages, including messages preceded by the medical transports signal = PAN PAN calls |
| c) | Communications relating to direction finding = requesting QDM, QTE etc |
| d) | Flight safety messages = movement and control messages, eg ATC giving instructions such as climb, descend, turn etc |
| e) | Meteorological messages |
| f) | Flight regularity messages = operations, servicing, scheduling etc |
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This question has appeared on the real examination, you can find the related countries below.
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Austro Control3
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Finland1
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Greece1
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Hungary1
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Italy1
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Poland1
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Switzerland1
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