One month ago, I posted a quizz about radio-nagivation, in the post “GPS Failure ! Are you ready ?“. I know I promised the answers one week later, so yes I’m late on this one, but here are the answers.

1: You fly away from a VOR on radial 030, how do you set your OBS ?
b) 030 selected – flag FROM - The selected radial must always be coherent with the heading, and the flag with the operation. Heading = radial, flag FROM when flying away.

2: From the previous situation, how to go back to the VOR ?
b) Turn around, select radial 210, fly towards needle to re-center it – Same as above. Technically it is possible to simply turn around and then fly away from the needle (non-commanding instrument), but this is the best way to get lost.

3: You fly to a VOR on heading 360. How should you report to ATC ?
d) Radial 180 inbound - You are south of the VOR, so on radial 180, and fly this radial inbound.

4: You fly away from an NDB on an north-easterly heading, this is…
c) QDR 045 – QDR 045: flying away from station on heading 045, by definition.

5: To check your position relatively to an airport, you request…
a) QDR – Magnetic heading from the airport to you, the easiest thing to draw on your chart.

6: You need heading to the airport, so you request…
c) QDM - Magnetic heading to fly to go to the airport

7: VOR needle is centered, radial 210 selected and TO flag, you are…
a) North-east of the VOR – You fly to the VOR on heading 210, so position is North-East.

8: When do you select a radial 180° away from heading ?
d) Never ever do that ! - See question 1

If anything seems unclear to you, I’ll be happy to answer any question you may have.