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Situados a 10 millas del faro de Trafalgar y a 8 millas del faro de Punta de Gracia, cuál será el rumbo de aguja al Puerto de Barbate (luz roja espigón) con corrección total= 5º NE:Positioned 10 miles from Cape Trafalgar lighthouse and 8 miles from Punta de Gracia lighthouse, what is the compass course to Barbate port (red breakwater light) with Ct = 5º NE?
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Correct answer: c) 004º
Why it is correct
Intersecting a 10-mile arc from Cape Trafalgar with an 8-mile arc from Punta de Gracia fixes the vessel at 36º 01.0′ N, 005º 56.5′ W. From there to Barbate red light (36º 11.3′ N, 005º 55.3′ W), true course is Rv = 009º; with Ct = +5º (NE), Ra = 009º − 5º = 004º.
Why the others are not
- a) Does not subtract Ct = +5º from true course Rv = 009º towards Barbate.
- b) Does not subtract Ct = +5º from true course Rv = 009º towards Barbate.
- d) Does not subtract Ct = +5º from true course Rv = 009º towards Barbate.
How to work it out in the exam
- Intersect the 10′ arc from Trafalgar and 8′ arc from Punta de Gracia (36º 01.0′ N, 005º 56.5′ W).
- Measure the true course to Barbate (Rv = 009º) and subtract Ct = +5º: Ra = 004º.
Where this question comes from
- Región de Murcia · 2022 · 1ª convocatoria · PER Tipo 1 · question 42 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.