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A HRB = 1000 nos encontramos situados sobre la línea de oposición de los faros: Isla de Tarifa y Punta Cires. Simultáneamente tomamos distancia al faro de Punta Alcázar = 6 millas. ¿Qué posición tendremos en ese instante?At 10:00 ship’s time on the opposition line of Isla de Tarifa and Punta Cires lighthouses, you simultaneously measure a radar distance of 6 miles to Punta Alcázar. What is your position?
Show the answer
Correct answer: c) 35º 56.8' N - 005º 31.8' W.
Why it is correct
Along the line joining Isla de Tarifa (36º 00.0′ N, 005º 36.6′ W) and Punta Cires (35º 54.7′ N, 005º 28.8′ W), a 6-mile range arc from Punta Alcázar (35º 50.8′ N, 005º 33.4′ W) intersects between the two lights at 35º 56.8′ N, 005º 31.8′ W.
Why the others are not
- a) Does not match the intersection of the 6-mile arc from Punta Alcázar with the Tarifa–Cires segment.
- b) Does not match the intersection of the 6-mile arc from Punta Alcázar with the Tarifa–Cires segment.
- d) Does not match the intersection of the 6-mile arc from Punta Alcázar with the Tarifa–Cires segment.
How to work it out in the exam
- Draw the opposition line between Isla de Tarifa and Punta Cires.
- Intersect the segment between both lights with a 6-mile arc from Punta Alcázar: 35º 56.8′ N, 005º 31.8′ W.
Where this question comes from
- Región de Murcia · 2017 · 2ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
- Región de Murcia · 2025 · 3ª convocatoria · PER Tipo 1 · question 42 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.