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Al ser HRB = 08:00 navegamos al rumbo de aguja = 296º. Al cruzar la oposición de los faros de Cabo Trafalgar y Punta Camarinal, marcamos el faro de Cabo Trafalgar en demora de aguja = 303º. Calcular la corrección total.At HRB 08:00 steering compass course Ra = 296º, you cross the opposition line of Cape Trafalgar and Punta Camarinal lighthouses and observe Cape Trafalgar at compass bearing Da = 303º. Calculate the total compass error:
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Correct answer: a) –6º (minus)
Why it is correct
On the opposition line between Punta Camarinal lighthouse (36º 05.4′ N, 005º 47.9′ W) and Cape Trafalgar lighthouse (36º 11.0′ N, 006º 02.0′ W), the charted true bearing towards Cape Trafalgar is Dv = 297º. Subtracting compass bearing Da = 303º gives total compass error Ct = 297º − 303º = −6º.
Why the others are not
- b) Reverses the sign of Dv − Da or uses the compass course (296º) instead of Da = 303º.
- c) Reverses the sign of Dv − Da or uses the compass course (296º) instead of Da = 303º.
- d) Reverses the sign of Dv − Da or uses the compass course (296º) instead of Da = 303º.
How to work it out in the exam
- Measure on the chart the true bearing from Punta Camarinal towards Cape Trafalgar: Dv = 297º.
- Subtract the compass bearing: Ct = 297º − 303º = −6º.
Where this question comes from
- Junta de Andalucía · 2026 · 2ª convocatoria · PY Módulo de navegación · question 13 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.