VHF Direction Finding (VDF)

Question 1

What are the ICAO classes of DF bearing and the accuracies?

Answer 1

Class A - accurate to +/- 2 degrees

Class B - accurate to +/- 5 degrees

Class C - accurate to +/- 10 degrees

Class D - accurate to less than class c

Question 2

What bearings can be provided by a ground DF station?

Answer 2

QDM - magnetic bearing TO the st

QDR - magnetic bearing FROM the st