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El 10 de julio de 2024, nos encontramos en situación 37° 30,0′ N, 002° 05,0′ E y damos rumbo a un punto situado en 35º 39,0´ N y 002º 40,0´W. Calcular el rumbo verdadero que debemos hacer para llegar a dicho punto (redondear al grado más próximo).On 10 July 2024 we are at 37° 30.0′ N, 002° 05.0′ E and set course for a point at 35º 39.0´ N and 002º 40.0´W. Calculate the true course to reach that point (to the nearest degree).
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Correct answer: b) 244º
Why it is correct
Δlat = 111′ S. ΔLong = 285′ W, crossing Greenwich. Departure = 285′ × cos 36º35′ = 229′. Course S 64º W, or 244º.
Why the others are not
- a) It does not match the working.
- c) 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 · 2024 · 2ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.