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Situados sobre la línea de la enfilación de los faros de Trafalgar y de Cabo Roche, obtenemos distancia a Trafalgar = 7 millas. Desde esta posición damos rumbo al puerto de Barbate (luz roja del extremo del espigón del puerto). Calcular la velocidad que debemos llevar para realizar el recorrido en una horaOn the leading line of Cape Trafalgar and Cabo Roche lighthouses at 7 miles from Trafalgar, you head for Barbate port (red light at the end of the breakwater). What speed is needed to make the run in 1 hour?
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Correct answer: a) 5.5 knots.
Why it is correct
On the SE extension of the Cabo Roche–Cape Trafalgar leading line (143º), 7 miles from Trafalgar places us at 36º 05.4′ N, 005º 56.8′ W. The distance from there to Barbate breakwater red light (36º 11.3′ N, 005º 55.3′ W) is 5.5 miles, requiring 5.5 knots to cover in 1 hour.
Why the others are not
- b) Does not match the 5.5-mile distance between the starting fix and Barbate entrance.
- c) Does not match the 5.5-mile distance between the starting fix and Barbate entrance.
- d) Does not match the 5.5-mile distance between the starting fix and Barbate entrance.
How to work it out in the exam
- Plot the point on the Roche–Trafalgar alignment 7 miles SE of Trafalgar.
- Measure the distance to Barbate breakwater: 5.5 miles in 1 hour ⇒ 5.5 knots.
Where this question comes from
- Región de Murcia · 2017 · 2ª convocatoria · PER Tipo 1 · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.