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El 9 de junio de 2016, al encontrarnos en la enfilación de los faros de Cº Espartel y Pta. Malabata y a una distancia del faro de Cº Espartel de 5,4 millas, damos rumbo a pasar a 5 millas del faro de Punta Malabata, con viento del SE que nos produce un abatimiento de 8º. Calcular el rumbo de aguja, sabiendo que la declinación magnética de la carta es 6º NW 2006 (6' E) y el desvío de la aguja = ‒5º (menos).On 9 June 2016 on the Cape Spartel–Punta Malabata leading line at 5.4 miles from Cape Spartel, you head to pass 5 miles off Punta Malabata with a SE wind (8º leeway), chart dm 6º NW 2006 (6' E) and deviation –5º. Calculate Ra:
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Correct answer: c) 076º
Why it is correct
Extending WSW the Malabata–Spartel leading line 5.4 miles from Spartel places us at 35º 46.6′ N, 006º 02.0′ W. The tangent to pass 5 miles north of Punta Malabata gives surface course Rs = 058º. With a SE wind on the starboard side (8º port leeway), Rv = 058º + 8º = 066º. In 2016 dm = −6º + 1º = −5º; with deviation −5º, Ct = −10º and Ra = 066º + 10º = 076º.
Why the others are not
- a) Does not add 8º to offset port leeway or fails to add the 10º negative compass error.
- b) Does not add 8º to offset port leeway or fails to add the 10º negative compass error.
- d) Does not add 8º to offset port leeway or fails to add the 10º negative compass error.
How to work it out in the exam
- Plot the start 5.4′ from Spartel on the Malabata alignment and draw the tangent 5′ off Malabata: Rs = 058º.
- Add leeway (Rv = 058º + 8º = 066º) and apply Ct = −10º: Ra = 076º.
Where this question comes from
- Junta de Andalucía · 2016 · 2ª convocatoria · PY Módulo de navegación · question 12 Official paper · Official answer key
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