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Desde la situación 36º 06,6′ N, 006º 02,2′ W se pone rumbo al faro de Punta Malabata. Calcular el rumbo de aguja sabiendo que la corrección total = –6,5º.From position 36º 06.6' N, 006º 02.2' W you set course for Punta Malabata lighthouse with total compass error Ct = –6.5º. What is the compass course (Ra)?
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Correct answer: d) 147º
Why it is correct
Joining 36º 06.6′ N, 006º 02.2′ W to Punta Malabata lighthouse (35º 48.8′ N, 005º 45.0′ W) on the chart gives true course Rv = 140.5º. With Ct = −6.5º, the compass course is Ra = Rv − Ct = 140.5º − (−6.5º) = 147º.
Why the others are not
- a) Does not apply Ra = Rv − Ct = 140.5º + 6.5º = 147º.
- b) Does not apply Ra = Rv − Ct = 140.5º + 6.5º = 147º.
- c) Does not apply Ra = Rv − Ct = 140.5º + 6.5º = 147º.
How to work it out in the exam
- Plot on the chart the true course from 36º 06.6′ N, 006º 02.2′ W to Punta Malabata: Rv = 140.5º.
- Subtract the negative compass error: Ra = 140.5º − (−6.5º) = 147º.
Where this question comes from
- Junta de Andalucía · 2025 · 2ª convocatoria · PER Modelo A · question 44 Official paper · Official answer key
- Junta de Andalucía · 2025 · 2ª convocatoria · PER Modelo B · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.