Hover or tap underlined Spanish terms to see their translation and exam tip.
Navegamos en una embarcación que está en la oposición de los Faros de Cabo Trafalgar y Punta de Gracia y obtenemos en ese momento una demora de aguja (Da) de Cabo Trafalgar = 290° y una Da al Faro de Barbate= 350°. ¿Cuál será su situación verdadera en ese momento?Aboard a vessel on the opposition line of Cape Trafalgar and Punta de Gracia lighthouses, you obtain compass bearings Da Cape Trafalgar = 290° and Da Barbate lighthouse = 350°. Find your true position:
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Correct answer: b) l = 36º 08.2' N; L = 005º 55.1' W.
Why it is correct
On the Cape Trafalgar–Punta de Gracia opposition, true bearing to Trafalgar is Dv = 297º, so Ct = 297º − 290º = +7º. Thus true bearing to Barbate is Dv = 350º + 7º = 357º, intersecting the opposition at l = 36º 08.2′ N, L = 005º 55.1′ W.
Why the others are not
- a) Does not match the intersection of the Trafalgar–Punta de Gracia opposition with Dv(Barbate) = 357º.
- c) Does not match the intersection of the Trafalgar–Punta de Gracia opposition with Dv(Barbate) = 357º.
- d) Does not match the intersection of the Trafalgar–Punta de Gracia opposition with Dv(Barbate) = 357º.
How to work it out in the exam
- Find Ct = 297º − 290º = +7º and correct Dv(Barbate) = 350º + 7º = 357º.
- Intersect the Trafalgar–Punta de Gracia line with 177º from Barbate: 36º 08.2′ N, 005º 55.1′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2025 · Convocatoria de noviembre · PER Test 2 · question 45 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.