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Situados al Sur verdadero del faro de Punta Paloma y a 5´del faro de Malabata, se da rumbo a un punto situado a 3´al Norte del faro de Punta Cires (corrección total -3º), calcular el rumbo de aguja:Positioned due South true of Punta Paloma lighthouse at 5' from Punta Malabata lighthouse, you set course for 3' due North of Punta Cires lighthouse (Ct = –3º). Calculate the compass course:
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Correct answer: b) 076º
Why it is correct
Due South of Punta Paloma (005º 43.2′ W) at 5 miles from Punta Malabata fixes us at 35º 53.7′ N, 005º 43.2′ W. True course to 3′ North of Punta Cires (35º 57.7′ N, 005º 28.8′ W) is Rv = 073º; with Ct = −3º, Ra = 073º − (−3º) = 076º.
Why the others are not
- a) Does not apply Ra = Rv − Ct = 073º + 3º = 076º.
- c) Does not apply Ra = Rv − Ct = 073º + 3º = 076º.
- d) Does not apply Ra = Rv − Ct = 073º + 3º = 076º.
How to work it out in the exam
- Plot the point due S of Punta Paloma at 5′ from Malabata and join to 3′ N of Cires: Rv = 073º.
- Subtract Ct = −3º: Ra = 073º − (−3º) = 076º.
Where this question comes from
- Región de Murcia · 2022 · 1ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.