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Al cruzar la oposición de los faros de Isla de Tarifa y punta Cires, marcamos punta Alcázar en demora verdadera 205º. Calcular a qué distancia nos encontramos del faro de punta Europa.Crossing the opposition of Isla de Tarifa and Punta Cires lighthouses, you observe Punta Alcázar at true bearing 205º. How far are you from Punta Europa lighthouse?
Show the answer
Correct answer: b) 13.5′
Why it is correct
Intersecting the Isla de Tarifa–Punta Cires opposition line (130º/310º) with the 205º true bearing to Punta Alcázar fixes the vessel at 35º 56.5′ N, 005º 31.4′ W. Measuring from that fix to Punta Europa lighthouse (36º 06.5′ N, 005º 20.7′ W) gives 13.5 miles.
Why the others are not
- a) Does not match the distance measured from the intersection of both position lines to Punta Europa.
- c) Does not match the distance measured from the intersection of both position lines to Punta Europa.
- d) Does not match the distance measured from the intersection of both position lines to Punta Europa.
How to work it out in the exam
- Plot the Isla de Tarifa–Punta Cires opposition line and intersect it with true bearing 205º to Punta Alcázar.
- Measure with dividers the distance from that fix to Punta Europa lighthouse: 13.5 miles.
Where this question comes from
- Junta de Andalucía · 2022 · 3ª convocatoria · PER Modelo A · question 43 Official paper · Official answer key
- Junta de Andalucía · 2022 · 3ª convocatoria · PER Modelo B · question 45 Official paper · Official answer key
- Junta de Andalucía · 2025 · 3ª convocatoria · PER Modelo A · question 42 Official paper · Official answer key
- Junta de Andalucía · 2025 · 3ª convocatoria · PER Modelo B · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.