Hover or tap underlined Spanish terms to see their translation and exam tip.
Navegamos al rumbo verdadero 242º y velocidad 6 nudos. Al encontrarnos en la enfilación de los faros de punta Alcázar y punta Cires, marcamos el faro de punta Cires en demora de aguja 238º. Calcular la corrección total.Steaming on true course 242º at 6 knots, you cross the leading line of Punta Alcázar and Punta Cires lighthouses and observe Punta Cires at compass bearing Da = 238º. Calculate the total compass error:
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Correct answer: c) –11º (minus)
Why it is correct
On the leading line of Punta Cires and Punta Alcázar lighthouses (viewing Cires aligned with Alcázar towards the SW), the charted true bearing is Dv = 227º. Subtracting compass bearing Da = 238º gives total compass error Ct = 227º − 238º = −11º.
Why the others are not
- a) Reverses the sign of Dv − Da or uses the ship's course (242º) instead of the leading-line bearing.
- b) Reverses the sign of Dv − Da or uses the ship's course (242º) instead of the leading-line bearing.
- d) Reverses the sign of Dv − Da or uses the ship's course (242º) instead of the leading-line bearing.
How to work it out in the exam
- Measure on the chart the true bearing of the Punta Cires–Punta Alcázar alignment: Dv = 227º.
- Subtract the compass bearing: Ct = 227º − 238º = −11º.
Where this question comes from
- Junta de Andalucía · 2022 · 3ª convocatoria · PY Módulo de navegación · question 11 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.