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Encontrándonos al Sur de Punta Paloma y a 5 millas de Punta Malabata, ponemos rumbo verdadero a un punto situado al Norte de Punta Cires y 3 millas de dicha Punta. ¿Qué rumbo de aguja tendremos que seguir si la declinación magnética es 2º (-) y el desvío 1º (-) ?.Due South of Punta Paloma at 5 miles from Punta Malabata, you head for a point 3 miles due North of Punta Cires (variation –2º, deviation –1º). What compass course must you steer?
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Correct answer: c) 076º
Why it is correct
The meridian of Punta Paloma (005º 43.2′ W) intersects the 5-mile arc from Punta Malabata at 35º 53.7′ N, 005º 43.2′ W. From there to 3 miles North of Punta Cires (35º 57.7′ N, 005º 28.8′ W), true course is Rv = 073º; with Ct = −2º − 1º = −3º, Ra = 073º − (−3º) = 076º.
Why the others are not
- a) Does not subtract Ct = −3º from true course Rv = 073º.
- b) Does not subtract Ct = −3º from true course Rv = 073º.
- d) Does not subtract Ct = −3º from true course Rv = 073º.
How to work it out in the exam
- Plot the start due south of Punta Paloma at 5′ from Malabata and destination 3′ north of Cires: Rv = 073º.
- With Ct = −2º − 1º = −3º, compute Ra = 073º + 3º = 076º.
Where this question comes from
- Región de Murcia · 2021 · 2ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.