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A HRB = 20-00 se toma Da del Fº de Pta. Malabata 190º. En este momento se toma Za de la polar 355º (supuesta en el polo). Calcular la Dv del Fº de Pta. Malabata.At 20:00 ship’s time you take a compass bearing of Punta Malabata lighthouse Da = 190º while observing Polaris at compass azimuth Za = 355º (assumed at the Pole). What is the true bearing (Dv) of Punta Malabata?
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Correct answer: d) Dv = 195º.
Why it is correct
With Polaris at the North Pole (Zv = 360º), total compass error is Ct = 360º − 355º = +5º. Applying it to the compass bearing gives Dv = Da + Ct = 190º + 5º = 195º.
Why the others are not
- a) Does not add the total compass error Ct = +5º to the compass bearing Da = 190º.
- b) Does not add the total compass error Ct = +5º to the compass bearing Da = 190º.
- c) Does not add the total compass error Ct = +5º to the compass bearing Da = 190º.
How to work it out in the exam
- Compute total compass error from Polaris: Ct = 360º − 355º = +5º.
- Add Ct to the compass bearing: Dv = 190º + 5º = 195º.
Where this question comes from
- Junta de Andalucía · 2015 · 3ª convocatoria · PY Módulo de navegación · question 14 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.