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Al estar en la oposición de los faros de Cº Espartel y Pta. Malabata, marcamos el faro de Pta. Malabata en demora de aguja 071º. Calcular la corrección total.While on the opposition line of Cape Spartel and Punta Malabata lighthouses, you observe Punta Malabata lighthouse at a compass bearing of 071º. Calculate the total compass error:
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Correct answer: d) +9º (plus)
Why it is correct
On the opposition line between Cape Spartel lighthouse (35º 47.5′ N, 005º 55.5′ W) and Punta Malabata lighthouse (35º 48.8′ N, 005º 45.0′ W), the charted true bearing towards Punta Malabata is Dv = 080º. Therefore total compass error is Ct = Dv − Da = 080º − 071º = +9º.
Why the others are not
- a) Reverses the sign of Dv − Da or measures a true bearing other than 080º.
- b) Reverses the sign of Dv − Da or measures a true bearing other than 080º.
- c) Reverses the sign of Dv − Da or measures a true bearing other than 080º.
How to work it out in the exam
- Measure on the chart the true bearing from Cape Spartel to Punta Malabata: Dv = 080º.
- Subtract the compass bearing: Ct = 080º − 071º = +9º.
Where this question comes from
- Junta de Andalucía · 2016 · 3ª convocatoria · PY Módulo de navegación · question 12 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.