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A HRB: 1200 obtenemos mediante radar distancias simultáneas a: - Faro de Paloma= 7 millas - Faro de Punta Alcázar= 10 millas Situados damos rumbo a la farola del puerto de Tánger (corrección total= 6º NE), teniendo en cuenta que sopla un viento de poniente que nos produce un abatimiento de 5º. Calcular rumbo de aguja a poner.At HRB 1200 radar gives simultaneous distances of 7 miles to Punta Paloma and 10 miles to Punta Alcázar; from this fix you head for Tangier port light (Ct = 6º NE) with a West wind causing 5º leeway. Find Ra:
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Correct answer: a) 198º
Why it is correct
Intersecting the 7-mile arc from Punta Paloma and 10-mile arc from Punta Alcázar fixes the vessel at 35º 56.8′ N, 005º 43.4′ W. From there the surface course to Tangier port light (35º 47.4′ N, 005º 48.2′ W) is Rs = 199º. With a West wind on the starboard side (5º port leeway), Rv = 199º + 5º = 204º; with Ct = +6º, Ra = 204º − 6º = 198º.
Why the others are not
- b) Does not offset the westerly leeway to starboard (+5º) or fails to subtract Ct = +6º.
- c) Does not offset the westerly leeway to starboard (+5º) or fails to subtract Ct = +6º.
- d) Does not offset the westerly leeway to starboard (+5º) or fails to subtract Ct = +6º.
How to work it out in the exam
- Plot the intersection of 7′ from Paloma and 10′ from Alcázar (35º 56.8′ N, 005º 43.4′ W) and measure Rs = 199º to Tangier.
- Offset the West wind (Rv = 199º + 5º = 204º) and subtract Ct = +6º: Ra = 198º.
Where this question comes from
- Región de Murcia · 2024 · 3ª convocatoria · PY Tipo 1 · question 32 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.