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Al ser HRB = 11:00 nos encontramos en situación 32º 15' N, 179º 40' E. Navegamos a 12 nudos al rumbo verdadero 135º hasta HRB = 16:30, momento en el que damos rumbo a la situación 29º 37' N, 176º 21' W. Calcular el rumbo directo (aproximar al grado más próximo).At ship’s clock 11:00 we are at 32º 15' N, 179º 40' E. We sail at 12 knots on true course 135º until 16:30, when we set course for 29º 37' N, 176º 21' W. Calculate the direct course (to the nearest degree).
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Correct answer: c) 125º
Why it is correct
First find the 16:30 position: 66 miles at 135º lead to 31º 28.3′ N, 179º 25.1′ W. From there, the course to the point is 125º.
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 · 2ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.