Discussion
Transport wander for an aircraft flying east at a groundspeed giving a change of longitude of 6 degrees per hour at latitude 45 degrees is approximately
Answer: B
Correct answer: 4.2 degrees per hour
Transport wander is the rate of change of longitude multiplied by the sine of the latitude:
\[ 6 \times \sin 45^\circ = 6 \times 0.707 = 4.24\ \mathrm{deg/h} \]
It arises because moving east or west changes the direction of true north relative to a space-fixed axis, by an amount that depends on the convergence of the meridians. The same sine of latitude appears as in earth rate, which is why the two combine so simply.
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