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Al encontrarnos en la oposición de los faros de Isla de Tarifa y Punta Alcázar y al Oeste verdadero del faro de Punta Cires, damos rumbo a pasar a 5 millas del faro de Punta Almina, teniendo en cuenta que sopla viento del SE que nos produce un abatimiento de 15º. Declinación magnética = 5º NW. Desvío de la aguja = +10º (más). Calcular el rumbo de aguja.On the Isla de Tarifa–Punta Alcázar opposition and due West true of Punta Cires lighthouse, you head to pass 5 miles off Punta Almina with a SE wind causing 15º leeway (variation 5º NW, deviation +10º). Calculate Ra:
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Correct answer: c) 082º
Why it is correct
The intersection of the Tarifa–Alcázar opposition with the parallel of Punta Cires is 35º 54.7′ N, 005º 34.6′ W. From there the tangent to pass 5 miles north of Punta Almina lighthouse is Rs = 072º. With a SE wind on the starboard side (15º port leeway), steer 15º to starboard: Rv = 072º + 15º = 087º. With Ct = −5º + 10º = +5º, Ra = 087º − 5º = 082º.
Why the others are not
- a) Subtracts instead of adding 15º to offset the SE wind or misapplies Ct = +5º.
- b) Subtracts instead of adding 15º to offset the SE wind or misapplies Ct = +5º.
- d) Subtracts instead of adding 15º to offset the SE wind or misapplies Ct = +5º.
How to work it out in the exam
- Plot the start and draw the tangent 5 miles north of Punta Almina: Rs = 072º.
- Offset the SE leeway (Rv = 072º + 15º = 087º) and subtract Ct = +5º: Ra = 082º.
Where this question comes from
- Junta de Andalucía · 2020 · 3ª convocatoria · PY Módulo de navegación · question 12 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.