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Navegamos al rumbo verdadero 130º y tomamos marcación al faro de cabo Trafalgar 090º Br (babor) y distancia 6,3 millas. Calcular la situación.Steering true course 130º, you take a relative bearing of Cape Trafalgar lighthouse = 090º Port at a distance of 6.3 miles. Calculate your position:
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Correct answer: a) 36º 06.2' N; 006º 07.1' W
Why it is correct
With Rv = 130º and relative bearing 090º port, the true bearing to Cape Trafalgar lighthouse is Dv = 130º − 90º = 040º (reciprocal 220º from the light). At 6.3 miles along 220º from Trafalgar (36º 11.0′ N, 006º 02.0′ W), the position is 36º 06.2′ N, 006º 07.1′ W.
Why the others are not
- b) Does not match a position bearing 220º true at 6.3 miles from Cape Trafalgar lighthouse.
- c) Does not match a position bearing 220º true at 6.3 miles from Cape Trafalgar lighthouse.
- d) Does not match a position bearing 220º true at 6.3 miles from Cape Trafalgar lighthouse.
How to work it out in the exam
- Compute the true bearing to Trafalgar: Dv = 130º − 90º = 040º (reciprocal 220º).
- Measure 6.3 miles along 220º from Cape Trafalgar: 36º 06.2′ N, 006º 07.1′ W.
Where this question comes from
- Junta de Andalucía · 2022 · 1ª convocatoria · PER Modelo A · question 42 Official paper · Official answer key
- Junta de Andalucía · 2022 · 1ª convocatoria · PER Modelo B · question 43 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.