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Estamos situados a 3 millas al Sur verdadero del faro de Punta Europa y damos rumbo para pasar a 1 milla al Sur verdadero del faro de Isla de Tarifa. La variación local= 2ºW; el desvío de aguja= -3º. Calcule el rumbo de aguja que debemos ponerPositioned 3 miles due South true of Punta Europa lighthouse, you set course to pass 1 mile due South true of Isla de Tarifa lighthouse (variation 2º W, deviation –3º). Calculate the compass course:
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Correct answer: c) 255º
Why it is correct
Joining the point 3 miles South of Punta Europa (36º 03.5′ N, 005º 20.7′ W) to the point 1 mile South of Isla de Tarifa (35º 59.0′ N, 005º 36.6′ W) gives charted true course Rv = 250º. With Ct = −2º − 3º = −5º, compass course is Ra = 250º − (−5º) = 255º.
Why the others are not
- a) Does not subtract Ct = −5º from true course Rv = 250º.
- b) Does not subtract Ct = −5º from true course Rv = 250º.
- d) Does not subtract Ct = −5º from true course Rv = 250º.
How to work it out in the exam
- Plot on the chart the course from 3′ S of Punta Europa to 1′ S of Tarifa: Rv = 250º.
- With Ct = −2º − 3º = −5º, compute Ra = 250º + 5º = 255º.
Where this question comes from
- Región de Murcia · 2019 · 2ª convocatoria · PER Tipo 1 · question 45 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.