An aircraft is to track from NDB A to NDB B. The RMI of NDB B reads 357 & RMI of NDB A reads 177. The aircraft is:
A: Drifted left of track
B: Drifted right of track
C: On track
I think it is 'C' but the answer is 'A' can someone explain this?
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You are right, the correct answer should be C.
Those two bearings are reciprocals of each other. Being 180 degrees out from each other, the lines are parallel. Parallel lines never intersect, so the only way that you can be on both at the same time if is they are overlaid on the same track; I.e. a single straight line between the two points.
If you had drifted off course from a direct track between the two ground stations, the two bearing lines would be at angles to one another, and you would be at the point where they intersect.