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A HRB= 1800 desaparece la niebla y toman posición radar sobre la carta en el Sur verdadero del Faro de Trafalgar a 15’. Desde esa posición, dan rumbo hacia el puerto de Tánger (luz extremo del espigón del puerto) con toda la vela arriba y 8 nudos, teniendo en cuenta que un viento del Noreste que sopla fresquito les produce 5º de abatimiento (variación local= 2º W y desvío de aguja= +6º) Proceden a calcular el rumbo de aguja para entrar en Tánger, teniendo en cuenta las anteriores variables:At HRB 1800, 15' due South true of Trafalgar lighthouse, you set course for Tangier (breakwater end light) under sail at 8 knots with a fresh NE wind causing 5º leeway (variation 2º W, deviation +6º). Calculate the compass course:
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Correct answer: a) 117º
Why it is correct
From 15 miles South of Cape Trafalgar (35º 56.0′ N, 006º 02.0′ W) to Tangier breakwater (35º 47.4′ N, 005º 48.2′ W), the required surface course is Rs = 126º. With a NE wind on the port side (+5º starboard leeway), true heading must be Rv = 126º − 5º = 121º. With Ct = −2º + 6º = +4º, Ra = 121º − 4º = 117º.
Why the others are not
- b) Adds instead of subtracting the starboard leeway (+5º) or positive compass error (Ct = +4º).
- c) Adds instead of subtracting the starboard leeway (+5º) or positive compass error (Ct = +4º).
- d) Adds instead of subtracting the starboard leeway (+5º) or positive compass error (Ct = +4º).
How to work it out in the exam
- Measure on the chart the course from 15′ S of Trafalgar to Tangier: Rs = 126º.
- Correct for starboard leeway (Rv = 126º − 5º = 121º) and subtract Ct = +4º: Ra = 117º.
Where this question comes from
- Región de Murcia · 2019 · 2ª convocatoria · PY Tipo 1 · question 40 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.