Chart Navigation & Plotting · Plane Sailing — Departure
In plane sailing, 'departure' is:
- AThe difference of latitude in degrees
- BThe time of leaving port
- CThe course steered
- DThe east-west distance made good, in nautical miles✓ Correct
Explanation
Departure is the east-west distance in nautical miles. It relates to difference of longitude by departure = dLong (in minutes) × cos(latitude), because meridians converge toward the poles.
Authority: Bowditch (Pub. No. 9), sailings
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