Discussion
Two units disagree in heading by 4.5 degrees against a comparator threshold of 3 degrees. The system will
Answer: C
Correct answer: Raise a comparator warning
The disagreement of \( 4.5 \) degrees exceeds the \( 3 \) degree threshold, so the comparator flags it. That is the entire function of the monitor: it detects that the two units are inconsistent to a degree that cannot be attributed to normal spread.
With only two units the system cannot tell which is at fault, so it must not select one or average them - averaging would produce a heading that is wrong by half the discrepancy and, worse, would conceal the fault. Ignoring a difference beyond the threshold would defeat the monitor. Identifying the faulty unit requires a third.
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