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A HRB: 1000 vemos el Faro de Punta Gracia en marcación por la proa y simultáneamente marcamos el Faro de Trafalgar por el través de babor 90º, desde la situación obtenida ¿a qué distancia estaremos de la luz roja del espigón del puerto de Barbate?At HRB 1000 you observe Punta de Gracia lighthouse dead ahead while Cape Trafalgar lighthouse is 90º abeam to port. From this fix, what is your distance to Barbate port red breakwater light?
Show the answer
Correct answer: d) 7.5 miles
Why it is correct
Seeing Punta de Gracia dead ahead and Cape Trafalgar 90º abeam to port when heading East (Rv = 090º) fixes the vessel on the latitude of Punta de Gracia (36º 05.4′ N) and the meridian of Cape Trafalgar (006º 02.0′ W). Measuring from 36º 05.4′ N, 006º 02.0′ W to Barbate red breakwater light gives 7.5 miles.
Why the others are not
- a) Does not plot the intersection of the Punta de Gracia parallel and Trafalgar meridian at 7.5′ from Barbate.
- b) Does not plot the intersection of the Punta de Gracia parallel and Trafalgar meridian at 7.5′ from Barbate.
- c) Does not plot the intersection of the Punta de Gracia parallel and Trafalgar meridian at 7.5′ from Barbate.
How to work it out in the exam
- Plot the fix due South of Trafalgar and due West of Punta de Gracia (36º 05.4′ N, 006º 02.0′ W).
- Measure the distance to Barbate red breakwater light: 7.5 miles.
Where this question comes from
- Región de Murcia · 2024 · 3ª convocatoria · PY Tipo 1 · question 31 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.