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Una embarcación quiere navegar desde un punto A situado en Latitud: 35°53.4’N y Longitud: 006°10.0’W, hasta otro punto B, situado a 10 millas al Norte verdadero del faro de Punta Malabata. La variación local (dm) es 2º NW y el desvío de aguja es 12º NW. ¿Qué rumbo de aguja deberá poner?A vessel wants to sail from point A (35° 53.4' N, 006° 10.0' W) to point B located 10 miles due North true of Punta Malabata lighthouse (variation 2º NW, deviation 12º NW). What compass course must it steer?
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Correct answer: b) Ra = 089º
Why it is correct
Point B (10′ North of Punta Malabata) lies at 35º 58.8′ N, 005º 45.0′ W. Laying the course from A (35º 53.4′ N, 006º 10.0′ W) to B gives Rv = 075º. With Ct = −2º − 12º = −14º, the compass course is Ra = 075º − (−14º) = 089º.
Why the others are not
- a) Does not apply Ra = Rv − Ct = 075º + 14º = 089º.
- c) Does not apply Ra = Rv − Ct = 075º + 14º = 089º.
- d) Does not apply Ra = Rv − Ct = 075º + 14º = 089º.
How to work it out in the exam
- Plot A (35º 53.4′ N, 006º 10.0′ W) and B (10′ N of Malabata) and measure the true course: Rv = 075º.
- With Ct = −2º − 12º = −14º, compute Ra = 075º + 14º = 089º.
Where this question comes from
- Región de Murcia · 2023 · 2ª convocatoria · PER Tipo 1 · question 42 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.