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A HRB= 20-00 estando en la oposición Pta Europa-Pta Almina, se toma Da a Pta Europa de 338º. Se pide la corrección total.At HRB 20-00 while on the opposition line between Punta Europa and Punta Almina, you take a compass bearing of Punta Europa Da = 338º. Find the total compass error:
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Correct answer: a) Ct = 8º +
Why it is correct
On the opposition line between Punta Europa lighthouse (36º 06.5′ N, 005º 20.7′ W) and Punta Almina lighthouse (35º 54.0′ N, 005º 16.5′ W), the charted true bearing to Punta Europa is Dv = 346º. Therefore Ct = Dv − Da = 346º − 338º = +8º.
Why the others are not
- b) Reverses the sign of Dv − Da or uses the wrong true bearing for the Europa–Almina opposition.
- c) Reverses the sign of Dv − Da or uses the wrong true bearing for the Europa–Almina opposition.
- d) Reverses the sign of Dv − Da or uses the wrong true bearing for the Europa–Almina opposition.
How to work it out in the exam
- Measure on the chart the true bearing from Punta Almina towards Punta Europa: Dv = 346º.
- Subtract the compass bearing: Ct = 346º − 338º = +8º.
Where this question comes from
- Junta de Andalucía · 2015 · 1ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
- Junta de Andalucía · 2015 · 1ª convocatoria · PER Modelo B · question 42 Official paper · Official answer key
- Junta de Andalucía · 2015 · 1ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.