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Al ser HRB = 11 00 del 16 de noviembre de 2024 nos encontramos en la oposición de los faros de Punta Carnero y Punta Europa y a 2,4 millas de Punta Carnero. Calcular el rumbo de aguja para llegar a Ceuta (luz verde de la bocana del puerto), sabiendo que la declinación magnética indicada en la carta es 3° 00′ E 2014 (6′ W) y que el desvío de la aguja es +9° (más).On 16 November 2024 at 11:00 on the Punta Carnero–Punta Europa opposition at 2.4 miles from Punta Carnero, find the compass course to Ceuta (green entrance light) given chart variation 3° 00' E 2014 (6' W) and deviation +9°:
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Correct answer: a) 153º
Why it is correct
On the Punta Carnero–Punta Europa opposition 2.4 miles from Carnero we are at 36º 05.3′ N, 005º 23.0′ W, from which true course to Ceuta green light is Rv = 164º. In 2024 (10 years): dm = 3º E − 60′ W = +2º; Ct = +2º + 9º = +11º and Ra = 164º − 11º = 153º.
Why the others are not
- b) Does not subtract Ct = +11º (variation +2º, deviation +9º) from true course Rv = 164º.
- c) Does not subtract Ct = +11º (variation +2º, deviation +9º) from true course Rv = 164º.
- d) Does not subtract Ct = +11º (variation +2º, deviation +9º) from true course Rv = 164º.
How to work it out in the exam
- Plot the point on the Carnero–Europa opposition 2.4′ from Carnero and measure course to Ceuta: Rv = 164º.
- Update variation to 2024 (+2º), add deviation +9º (Ct = +11º) and compute Ra = 164º − 11º = 153º.
Where this question comes from
- Junta de Andalucía · 2024 · 3ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.