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Al encontrarnos en la enfilación de los faros de Cabo Espartel y Punta Malabata y a 4 millas de Cabo Espartel, damos rumbo a pasar a 4 millas del faro de Punta Malabata. Calcular el rumbo de aguja, sabiendo que la declinación magnética de la carta es 4º E 2006 (6' W) y el Desvío de la aguja = +5º (más).On the leading line of Cape Spartel and Punta Malabata lighthouses at 4 miles from Cape Spartel, you set course to pass 4 miles off Punta Malabata (chart variation 4º E 2006 (6' W), deviation = +5º). What is the compass course?
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Correct answer: d) 055º
Why it is correct
On the Spartel–Malabata leading line west of Cape Spartel (bearing 260º from Spartel at 4 miles: 35º 46.8′ N, 006º 00.3′ W), the tangent course to pass 4 miles north of Punta Malabata is Rv = 062º. With dm ≈ +2º and Δ = +5º (Ct = +7º), Ra = 062º − 7º = 055º.
Why the others are not
- a) Does not match true course 062º corrected by Ct = +7º.
- b) Does not match true course 062º corrected by Ct = +7º.
- c) Does not match true course 062º corrected by Ct = +7º.
How to work it out in the exam
- Plot the point on the leading line 4 miles west of Spartel and draw the tangent to the 4-mile arc off Malabata: Rv = 062º.
- Apply Ra = Rv − Ct = 062º − 7º = 055º.
Where this question comes from
- Junta de Andalucía · 2016 · 2ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
- Junta de Andalucía · 2016 · 2ª convocatoria · PER Modelo B · question 44 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.