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A HRB = 12:00 nos encontramos en la enfilación de los faros Cabo Trafalgar y Cabo Roche y simultáneamente al OESTE verdadero del Faro de Punta Camarinal. Situados damos rumbo a pasar a 5 millas del Faro de Cabo Roche, teniendo en cuenta que tenemos un viento del SW que nos produce un abatimiento de 20º. Calcular el rumbo verdadero para pasar a 5 millas del faro de Cabo Roche.At HRB 12:00 on the Cape Trafalgar–Cabo Roche leading line and due West true of Punta Camarinal lighthouse, you set course to pass 5 miles off Cabo Roche lighthouse with a SW wind causing 20º leeway. Find the true course Rv:
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Correct answer: a) 324º
Why it is correct
From the fix on the Trafalgar–Roche alignment due West of Punta Camarinal (36º 05.4′ N, 005º 57.2′ W), the tangent to the 5-mile circle off Cabo Roche gives a track angle of 304º. Applying the 20º leeway correction yields 304º + 20º = 324º.
Why the others are not
- b) Does not apply the 20º leeway correction to the 304º tangent course.
- c) Does not apply the 20º leeway correction to the 304º tangent course.
- d) Does not apply the 20º leeway correction to the 304º tangent course.
How to work it out in the exam
- Plot the intersection of the Trafalgar–Roche alignment with the parallel of Punta Camarinal and draw the tangent 5′ off Cabo Roche (304º).
- Apply the 20º leeway angle: 304º + 20º = 324º.
Where this question comes from
- Junta de Andalucía · 2017 · 2ª convocatoria · PY Módulo de navegación · question 15 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.