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Desde la posición en la carta 36º 00'N - 005º 55'W, damos rumbo al Puerto de Tánger (luz del extremo del espigón del Puerto) con velocidad de 10 nudos y corrección total= 5º NE Calcule el rumbo de aguja (Ra) a poner:From charted position 36º 00' N – 005º 55' W you set course for Tangier port (breakwater end light) at 10 knots with total compass error Ct = 5º NE. Calculate the compass course (Ra):
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Correct answer: b) 149º
Why it is correct
Joining 36º 00′ N, 005º 55′ W to Tangier breakwater end light (35º 47.4′ N, 005º 48.2′ W) on the chart gives true course Rv = 154º. With Ct = +5º (NE), the compass course is Ra = Rv − Ct = 154º − 5º = 149º.
Why the others are not
- a) Does not subtract Ct = +5º from true course Rv = 154º.
- c) Does not subtract Ct = +5º from true course Rv = 154º.
- d) Does not subtract Ct = +5º from true course Rv = 154º.
How to work it out in the exam
- Plot on the chart the true course from 36º 00′ N, 005º 55′ W to Tangier breakwater: Rv = 154º.
- Subtract the positive compass error: Ra = 154º − 5º = 149º.
Where this question comes from
- Región de Murcia · 2020 · 1ª convocatoria · PER Tipo 1 · question 43 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.