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Situados en la oposición de los faros de Pta. Malabata y Punta Gracia y distancia al faro de Punta Paloma = 6 millas. Damos rumbo a Tánger (luz extremo del espigón) con corrección total= 6ºW. Calcule el rumbo de aguja.On the opposition line of Punta Malabata and Punta de Gracia lighthouses at 6 miles from Punta Paloma lighthouse, you set course for Tangier (breakwater end light) with Ct = 6º W. Calculate the compass course:
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Correct answer: d) 188º
Why it is correct
Intersecting the Punta Malabata–Punta de Gracia opposition with the 6-mile arc from Punta Paloma fixes the vessel at 35º 58.1′ N, 005º 47.7′ W. From there to Tangier breakwater (35º 47.4′ N, 005º 48.2′ W), true course is Rv = 182º; with Ct = −6º, Ra = 182º − (−6º) = 188º.
Why the others are not
- a) Does not apply Ra = Rv − Ct = 182º − (−6º) = 188º.
- b) Does not apply Ra = Rv − Ct = 182º − (−6º) = 188º.
- c) Does not apply Ra = Rv − Ct = 182º − (−6º) = 188º.
How to work it out in the exam
- Intersect the Malabata–Punta de Gracia opposition with a 6-mile arc from Punta Paloma (35º 58.1′ N, 005º 47.7′ W).
- Measure the true course to Tangier (Rv = 182º) and compute Ra = 182º + 6º = 188º.
Where this question comes from
- Región de Murcia · 2019 · 2ª convocatoria · PER Tipo 1 · question 43 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.