Chart Navigation & Plotting · Sailings — Course from dLat and Departure
A leg produces 12.0' of northing (dLat) and 16.0 nm of easting (departure). What is the course made good?
- A037°T
- B053°T✓ Correct
- C127°T
- D045°T
Explanation
Course angle = arctan(departure ÷ dLat) = arctan(16.0 ÷ 12.0) = arctan(1.333) ≈ 53.1°. Northing and easting are both positive, so the course is in the NE quadrant: about 053°T.
Authority: Bowditch (Pub. No. 9), plane sailing; course from dLat and departure
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