Chart Navigation & Plotting · Sailings — Departure
On the same 045°T, 20 nm run, what is the departure (east-west distance) made good?
- A14.1 nautical miles east✓ Correct
- B20.0 nautical miles east
- C10.0 nautical miles east
- D28.3 nautical miles east
Explanation
Departure = distance × sin(course) = 20 × sin(45°) = 20 × 0.707 = 14.14 ≈ 14.1 nm east. Departure is the east-west distance in nautical miles, not yet converted to difference of longitude.
Authority: Bowditch (Pub. No. 9), plane sailing; departure
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