I've came across interesting question, which I cannot understand, so maybe somebody could give an idea why.
At 10:15 the reading from VOR/DME station is 211deg/90NM, at 10:20 the reading from the same VOR/DME station is 211deg/120NM
Magnetic Heading = 200deg
Variation = 31W
Drift = 12L
What is the True Track ?
a 163
b 157
c 180 // Correct answer
d 181
So at first, I saw the 211 Radial and calculated 211 - 31 = 180, which gave me the correct answer.
But then I started thinking more, and though, that given MH, Var and Drift and ignoring VOR radial should give the same result, so I decided to check. If I wasn't given the Radial information, then True Track calculation would be :
(MH) 200 - (VAR West) 31 - (Left Drift) 12 = 157(T)
So obviously it was a wrong approach, however in the questions, where the VOR radials are not mentioned, only MH, Var and Drift given, that is the way how True Track is calculated.
In reality I'd expect both calculations give the same result (ignoring the Deviation). So why the VOR reading in this case is given the priority, or am I missing something ?
Thanks.