Hover or tap underlined Spanish terms to see their translation and exam tip.
Hallándose una embarcación en la oposición del faro de Cabo Trafalgar y del Faro de Cabo Espartel, hallar la Corrección total si la demora de aguja al faro de Cabo Trafalgar es de 342°:A vessel on the opposition line of Cape Trafalgar and Cape Spartel lighthouses observes Cape Trafalgar at compass bearing 342º. Find the total compass error:
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Correct answer: d) 5º (+).
Why it is correct
On the opposition line between Cape Spartel (35º 47.5′ N, 005º 55.5′ W) and Cape Trafalgar (36º 11.0′ N, 006º 02.0′ W), the true bearing towards Cape Trafalgar is Dv = 347º. Thus Ct = Dv − Da = 347º − 342º = +5º.
Why the others are not
- a) Does not match the difference between Dv = 347º and Da = 342º.
- b) Does not match the difference between Dv = 347º and Da = 342º.
- c) Does not match the difference between Dv = 347º and Da = 342º.
How to work it out in the exam
- Measure on the chart the true bearing from Cape Spartel to Cape Trafalgar: Dv = 347º.
- Compute Ct = Dv − Da = 347º − 342º = +5º.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de diciembre · PER Test 1 · question 43 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de diciembre · PER Test 3 · question 45 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.