Determine the distance from LAT 23°24'S, LONG 13°54'E to LAT 23°24'S, LONG 42°48'W, by parallel sailing.

Correct Answer: Option B — 3122.2 miles

Parallel sailing formula: Departure = Δλ(min) × cos(Lat). The difference in longitude is 56°42' = 3402'. Distance = 3402 × cos(23.4°) = 3402 × 0.91775 = 3122.2 miles. This method is accurate for vessels traveling along the same parallel of latitude.