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El 13 de junio de 2026, al ser HRB = 12h 00m, navegamos a 6 nudos al rumbo de aguja 154° y nos encontramos a 5 millas al W verdadero (oeste) del faro de Cabo Roche. Calcular la demora verdadera y distancia que nos encontramos desde el faro de Cabo Trafalgar al ser HRB = 13h 42m. La declinación magnética de la carta = 5º 20′ W 2010 (5′ E) y desvío de la aguja = -10º (menos).On 13 June 2026 at 12h 00m, 5 miles due West of Cabo Roche lighthouse, you steer Ra = 154º at 6 knots (chart variation 5º 20' W 2010 (5' E), deviation −10º). What are the true bearing and distance from Cape Trafalgar at 13h 42m?
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Correct answer: c) 253º, 3.8 miles
Why it is correct
In 2026 (16 years after 2010): dm = 5º 20′ W − 80′ E = 4º W; Ct = −4º − 10º = −14º and Rv = 154º − 14º = 140º. In 1h 42m (1.7 h) at 6 knots you run 10.2 miles from 5′ W of Cabo Roche (36º 17.7′ N, 006º 14.6′ W) to 36º 09.9′ N, 006º 06.5′ W, which from Cape Trafalgar bears 253º true at 3.8 miles.
Why the others are not
- a) Does not match the position reached after running 10.2 miles on Rv = 140º from 5′ W of Cabo Roche.
- b) Does not match the position reached after running 10.2 miles on Rv = 140º from 5′ W of Cabo Roche.
- d) Does not match the position reached after running 10.2 miles on Rv = 140º from 5′ W of Cabo Roche.
How to work it out in the exam
- Update variation to 2026 (4º W), compute Ct = −14º, Rv = 140º and distance d = 6 × 1.7 = 10.2 miles.
- Plot 10.2 miles on 140º from 5′ W of Cabo Roche and measure from Cape Trafalgar: Dv = 253º and d = 3.8 miles.
Where this question comes from
- Junta de Andalucía · 2026 · 2ª convocatoria · PER Modelo A · question 44 Official paper · Official answer key
- Junta de Andalucía · 2026 · 2ª convocatoria · PER Modelo B · question 45 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.