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Navegando a rumbo de aguja 297º, se toma simultáneamente marcación del Faro de Cabo Espartel = 275º y marcación del Faro de Punta Malabata =189º. Siendo la declinación magnética= 4ºW y el desvío 2º(-). ¿Cuál será nuestra situación en ese momento?Steering compass course 297º (variation 4º W, deviation –2º), you simultaneously take relative bearings of 275º to Cape Spartel lighthouse and 189º to Punta Malabata lighthouse. What is your position?
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Correct answer: b) l = 35º 52.4' N; L = 005º 52.4' W.
Why it is correct
With Ct = −4º − 2º = −6º, true course is Rv = 297º − 6º = 291º. True bearings are Dv(Spartel) = 291º + 275º − 360º = 206º and Dv(Malabata) = 291º + 189º − 360º = 120º, intersecting on the chart at l = 35º 52.4′ N, L = 005º 52.4′ W.
Why the others are not
- a) Does not match the intersection of Dv(Spartel) = 206º with Dv(Malabata) = 120º.
- c) Does not match the intersection of Dv(Spartel) = 206º with Dv(Malabata) = 120º.
- d) Does not match the intersection of Dv(Spartel) = 206º with Dv(Malabata) = 120º.
How to work it out in the exam
- Compute Rv = 297º − 6º = 291º and true bearings Dv(Spartel) = 206º and Dv(Malabata) = 120º.
- Plot their reciprocals (026º from Spartel and 300º from Malabata): 35º 52.4′ N, 005º 52.4′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2024 · Convocatoria de junio · PER Test 2 · question 42 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2024 · Convocatoria de junio · PER Test 4 · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.