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A HRB= 0700 una vez amanecido, tienen en el radar al faro de Punta Europa por el Norte verdadero (Nv) y a 9,3 millas de distancia y una vez situados dan rumbo de aguja= 249º (corrección total= 6ºE) con velocidad de 8 nudos, navegando por la zona de navegación costera Sur del Dispositivo de Separación de Tráfico, pegados a la costa africana, con un viento del Norte que les produce 5º de abatimiento y calculan la HRB cuando tienen el faro de Malabata por el Sur verdadero.At HRB 0700 with Punta Europa bearing due North true at 9.3 miles, you steer Ra = 249º (Ct = 6º E) at 8 knots with a North wind causing 5º leeway. Calculate the HRB when Punta Malabata bears due South true:
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Correct answer: a) 0942
Why it is correct
At 9.3 miles South of Punta Europa (36º 06.5′ N, 005º 20.7′ W) we are at 35º 57.2′ N, 005º 20.7′ W. With Ra = 249º and Ct = +6º, Rv = 255º; the North wind sets us 5º to port ⇒ Rs = 250º. Along Rs = 250º to the meridian of Punta Malabata (005º 45.0′ W) is 21.6 miles, taking 2h 42m at 8 knots ⇒ HRB = 07:00 + 2h 42m = 09:42.
Why the others are not
- b) Does not measure the 21.6 miles along surface course Rs = 250º to the Malabata meridian.
- c) Does not measure the 21.6 miles along surface course Rs = 250º to the Malabata meridian.
- d) Does not measure the 21.6 miles along surface course Rs = 250º to the Malabata meridian.
How to work it out in the exam
- Plot the start 9.3′ S of Punta Europa and compute Rs = 249º + 6º − 5º = 250º.
- Measure distance along 250º to due north of Malabata (21.6′ at 8 knots = 2h 42m): 07:00 + 2h 42m = 0942.
Where this question comes from
- Región de Murcia · 2021 · 2ª convocatoria · PY Tipo 1 · question 32 Official paper · Official answer key
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