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Situados sobre la línea de la enfilación de los faros de Punta Paloma y la isla de Tarifa, tomamos distancia a Punta Cires: 5 millas. Desde esa posición damos rumbo verdadero 260º y velocidad 15 mudos. ¿Cuál será nuestra posición después de una hora y media de navegación?On the leading line of Punta Paloma and Isla de Tarifa lighthouses at 5 miles from Punta Cires, you steer true course 260º at 15 knots. What is your position after 1.5 hours?
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Correct answer: c) 35° 54.2' N / 006° 00.2' W
Why it is correct
Intersecting the Punta Paloma–Isla de Tarifa alignment with the 5-mile arc from Punta Cires fixes the start at 35º 58.1′ N, 005º 32.8′ W. Running 1.5 hours at 15 knots (22.5 miles) on Rv = 260º reaches 35º 54.2′ N, 006º 00.2′ W.
Why the others are not
- a) Does not match the position after running 22.5 miles on Rv = 260º from the start.
- b) Does not match the position after running 22.5 miles on Rv = 260º from the start.
- d) Does not match the position after running 22.5 miles on Rv = 260º from the start.
How to work it out in the exam
- Intersect the Paloma–Tarifa alignment with a 5-mile arc from Punta Cires (35º 58.1′ N, 005º 32.8′ W).
- Plot 22.5 miles (1.5 h at 15 knots) along Rv = 260º: 35º 54.2′ N, 006º 00.2′ W.
Where this question comes from
- Región de Murcia · 2023 · 3ª convocatoria · PER Tipo 1 · question 43 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.