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A HRB = 08:15 nos encontramos al Sur verdadero del faro de Punta Paloma y al Oeste verdadero del faro de la Isla de Tarifa. Navegamos a 8 nudos al rumbo verdadero 290º y nos afecta una corriente de Rc = SW e Ih = 3 millas. Calcular la demora verdadera al faro de Trafalgar a HRB = 09:45.At HRB 08:15 when due South true of Punta Paloma lighthouse and due West true of Isla de Tarifa lighthouse, you steer Rv = 290º at 8 knots in a SW current of Ihc = 3 knots. Find the true bearing to Trafalgar at HRB 09:45:
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Correct answer: d) 356º
Why it is correct
The start (S of Paloma, W of Tarifa) is 36º 00.0′ N, 005º 43.2′ W. Over 1.5 hours (08:15 to 09:45) the vessel runs 12 miles along Rv = 290º plus 4.5 miles of current along SW (225º), reaching 36º 01.0′ N, 006º 00.9′ W at 09:45. From this position Cape Trafalgar lighthouse (36º 11.0′ N, 006º 02.0′ W) bears Dv = 356º.
Why the others are not
- a) Does not combine the 12 miles on 290º with the 4.5 miles on 225º before measuring the bearing to Trafalgar.
- b) Does not combine the 12 miles on 290º with the 4.5 miles on 225º before measuring the bearing to Trafalgar.
- c) Does not combine the 12 miles on 290º with the 4.5 miles on 225º before measuring the bearing to Trafalgar.
How to work it out in the exam
- From 36º 00.0′ N, 005º 43.2′ W plot 12 miles along 290º and add 4.5 miles along 225º (1.5 h).
- Measure from the resulting position the true bearing to Cape Trafalgar lighthouse: Dv = 356º.
Where this question comes from
- Junta de Andalucía · 2024 · 1ª convocatoria · PY Módulo de navegación · question 16 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.