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Desde la situación 28º 10′ N, 179º 25′ W, damos rumbo a la situación 25º 55′ N, 178º 24′ E. Calcular Rumbo directo.From 28º 10′ N, 179º 25′ W, we set course for 25º 55′ N, 178º 24′ E. Calculate the direct course.
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Correct answer: c) 221º
Why it is correct
It crosses the 180º meridian westward: ΔLong = 131′. Δlat = 135′ S. Departure = 117′. Course S 41º W, or 221º.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- d) It does not match the working.
How to work it out in the exam
- Find the difference of latitude and the departure: ΔL × cos(mean latitude).
- Course = arctan(A / Δlat). Distance = root of the sum of squares.
Where this question comes from
- Junta de Andalucía · 2022 · 1ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.