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Navegamos a 10 nudos al rumbo verdadero 070º. Al cruzar la oposición de los faros de Punta Europa y Punta Almina, tomamos demora de aguja al Faro de Punta Almina = 156º. Calcular la corrección total.Sailing at 10 knots on true course 070º across the opposition of Punta Europa and Punta Almina lighthouses, you take a compass bearing of Punta Almina = 156º. Calculate the total compass error:
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Correct answer: c) +10º (plus)
Why it is correct
On the Punta Europa–Punta Almina opposition line, the true bearing towards Punta Almina lighthouse is Dv = 166º. Therefore Ct = Dv − Da = 166º − 156º = +10º.
Why the others are not
- a) Does not subtract the compass bearing (156º) from the true bearing of the opposition towards Punta Almina (166º).
- b) Does not subtract the compass bearing (156º) from the true bearing of the opposition towards Punta Almina (166º).
- d) Does not subtract the compass bearing (156º) from the true bearing of the opposition towards Punta Almina (166º).
How to work it out in the exam
- Read on the chart the true bearing of Punta Almina on its opposition with Punta Europa: Dv = 166º.
- Find Ct = Dv − Da = 166º − 156º = +10º.
Where this question comes from
- Junta de Andalucía · 2016 · 1ª convocatoria · PER Modelo A · question 44 Official paper · Official answer key
- Junta de Andalucía · 2016 · 1ª convocatoria · PER Modelo B · question 42 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.