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A HRB= 20-00 estando en la oposición Pta Europa-Pta Almina, se toma Da a Pta Europa de 338º. Se pide la corrección total.At 20:00 ship’s time, while on the Punta Europa–Punta Almina opposition line, you take a compass bearing of Punta Europa = 338º. What is the total compass error (Ct)?
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Correct answer: a) Ct = 8º +
Why it is correct
On the opposition line between Punta Almina and Punta Europa, Punta Europa lighthouse bears 346º true (Dv = 346º). Therefore Ct = Dv − Da = 346º − 338º = +8º.
Why the others are not
- b) Does not apply Ct = Dv − Da using the true bearing of the opposition towards Punta Europa (346º).
- c) Does not apply Ct = Dv − Da using the true bearing of the opposition towards Punta Europa (346º).
- d) Does not apply Ct = Dv − Da using the true bearing of the opposition towards Punta Europa (346º).
How to work it out in the exam
- Measure on the chart the true bearing of Punta Europa along the opposition line with Punta Almina: Dv = 346º.
- Subtract the compass bearing: Ct = 346º − 338º = +8º.
Where this question comes from
- Junta de Andalucía · 2015 · 1ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
- Junta de Andalucía · 2015 · 1ª convocatoria · PER Modelo B · question 42 Official paper · Official answer key
- Junta de Andalucía · 2015 · 1ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.