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Al encontrarnos en la enfilación de los faros de punta Alcázar y punta Cires, marcamos este último en demora de aguja 220º. Navegamos al rumbo verdadero 230º. Calcular la corrección total.On the leading line (enfilación) of Punta Alcázar and Punta Cires lighthouses while steering true course 230º, you observe Punta Cires at compass bearing 220º. Calculate the total compass error:
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Correct answer: a) +7º (plus)
Why it is correct
North-east of Punta Cires, the leading line through Punta Cires and Punta Alcázar bears 227º true (Dv = 227º). Therefore Ct = Dv − Da = 227º − 220º = +7º.
Why the others are not
- b) Does not subtract the compass bearing (220º) from the true bearing of the Cires–Alcázar leading line (227º).
- c) Does not subtract the compass bearing (220º) from the true bearing of the Cires–Alcázar leading line (227º).
- d) Does not subtract the compass bearing (220º) from the true bearing of the Cires–Alcázar leading line (227º).
How to work it out in the exam
- Measure the true bearing of the Punta Cires–Punta Alcázar leading line: Dv = 227º.
- Subtract the compass bearing: Ct = 227º − 220º = +7º.
Where this question comes from
- Junta de Andalucía · 2022 · 2ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
- Junta de Andalucía · 2022 · 2ª convocatoria · PER Modelo B · question 43 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.