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Zarpamos del puerto Ceuta con rumbo al puerto de Algeciras (luz roja del extremo del espigón). Corrección total= 5º W ¿Cuál será el rumbo de aguja a poner?Departing Ceuta port bound for Algeciras port (red light at the end of the breakwater) with total compass error Ct = 5º W, what compass course must you steer?
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Correct answer: c) 343º
Why it is correct
Joining Ceuta harbour entrance (35º 53.8′ N, 005º 18.6′ W) to Algeciras breakwater red light (36º 07.5′ N, 005º 25.4′ W) on the chart gives true course Rv = 338º. With Ct = −5º (W), compass course is Ra = 338º − (−5º) = 343º.
Why the others are not
- a) Does not apply Ra = Rv − Ct = 338º + 5º = 343º.
- b) Does not apply Ra = Rv − Ct = 338º + 5º = 343º.
- d) Does not apply Ra = Rv − Ct = 338º + 5º = 343º.
How to work it out in the exam
- Plot on the chart the true course from Ceuta to Algeciras breakwater: Rv = 338º.
- Subtract the negative compass error: Ra = 338º − (−5º) = 343º.
Where this question comes from
- Región de Murcia · 2020 · 2ª convocatoria · PER Tipo 1 · question 45 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.