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A las 10h 00m del 17 de junio de 2023, navegando al rumbo verdadero 340º, nos encontramos al Sur verdadero del faro de Punta Camarinal y al Oeste verdadero del faro de la Isla de Tarifa. Situados, damos rumbo al puerto de Barbate (faro de Tierra). Calcular el rumbo de aguja, sabiendo que la declinación magnética es 6º NE y que el desvío de la aguja es +4º (más)At 10h 00m on 17 June 2023, located due South true of Punta Camarinal and due West true of Isla de Tarifa, you set course for the port of Barbate (shore light) with variation 6º NE and deviation +4º. What is the compass course?
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Correct answer: b) 324º
Why it is correct
Intersecting due south of Punta Camarinal (005º 48.6′ W) with due west of Isla de Tarifa (36º 00.0′ N) gives 36º 00.0′ N, 005º 48.6′ W. The true course to Barbate shore light is Rv = 334º; with Ct = +6º + 4º = +10º, Ra = 334º − 10º = 324º.
Why the others are not
- a) Does not subtract total compass error Ct = +10º from true course Rv = 334º.
- c) Does not subtract total compass error Ct = +10º from true course Rv = 334º.
- d) Does not subtract total compass error Ct = +10º from true course Rv = 334º.
How to work it out in the exam
- Plot 36º 00.0′ N, 005º 48.6′ W and measure the true course to Barbate light: Rv = 334º.
- With Ct = +6º + 4º = +10º, compute Ra = 334º − 10º = 324º.
Where this question comes from
- Junta de Andalucía · 2023 · 2ª convocatoria · PER Modelo A · question 45 Official paper · Official answer key
- Junta de Andalucía · 2023 · 2ª convocatoria · PER Modelo B · question 43 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.