Discussion
A gyro drifts at 4 degrees per hour from real causes. Over a 45 minute flight the accumulated real drift is
Answer: A
Correct answer: 3 degrees
Multiply the rate by the elapsed time in hours:
\[ 4 \times \frac{45}{60} = 4 \times 0.75 = 3^\circ \]
Real drift accumulates steadily and cannot be predicted from position, unlike apparent drift, so it can only be removed by realigning against the magnetic compass. Three degrees over three quarters of an hour is why the realignment interval is conventionally about fifteen minutes.
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