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Al cruzar la oposición de los faros de punta Paloma y punta Malabata, marcamos este último en demora de aguja 180º. Calcular la corrección total.Crossing the opposition line of Punta Paloma and Punta Malabata lighthouses, you observe Punta Malabata at compass bearing 180º. Calculate the total compass error:
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Correct answer: a) +5º (plus)
Why it is correct
On the opposition line between Punta Paloma (36º 04.0′ N, 005º 43.2′ W) and Punta Malabata (35º 48.8′ N, 005º 45.0′ W), the true bearing towards Punta Malabata is Dv = 185º. Thus Ct = Dv − Da = 185º − 180º = +5º.
Why the others are not
- b) Does not apply Ct = Dv − Da = 185º − 180º = +5º.
- c) Does not apply Ct = Dv − Da = 185º − 180º = +5º.
- d) Does not apply Ct = Dv − Da = 185º − 180º = +5º.
How to work it out in the exam
- Measure on the chart the true bearing from Punta Paloma to Punta Malabata: Dv = 185º.
- Compute Ct = Dv − Da = 185º − 180º = +5º.
Where this question comes from
- Junta de Andalucía · 2022 · 1ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
- Junta de Andalucía · 2022 · 1ª convocatoria · PER Modelo B · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.