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Al ser HRB = 16:00, nos encontramos a 3 millas al Este verdadero del faro de Punta Almina. Situados, damos rumbo al puerto de Algeciras (luz roja de la bocana del puerto), teniendo en cuenta que nos afecta una corriente de Rc = SW e Intensidad Horaria = 3 millas. Declinación magnética = 3º NW y Desvío de la aguja = –5º (menos). Calcular el rumbo de aguja para llegar a Algeciras a HRB = 20:00.At HRB 16:00, 3 miles due East true of Punta Almina lighthouse, you set course for Algeciras port (red entrance light) in a current setting SW at Ihc = 3 knots (variation 3º NW, deviation –5º) to arrive at HRB 20:00. Find Ra:
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Correct answer: d) Ra = 004º
Why it is correct
From 3 miles due East of Punta Almina (35º 54.0′ N, 005º 12.8′ W) to Algeciras red entrance light (36º 07.9′ N, 005º 26.0′ W) the passage takes 4 hours (16:00 to 20:00). Over those 4 h the SW current (225º, 3 knots) sets 12 miles along 225º; joining the tip of that 12-mile vector to Algeciras gives Rv = 356º. With Ct = −3º − 5º = −8º, Ra = 356º + 8º = 004º.
Why the others are not
- a) Does not lay off the 12 miles of current for the 4 hours or fails to add the 8º negative compass error.
- b) Does not lay off the 12 miles of current for the 4 hours or fails to add the 8º negative compass error.
- c) Does not lay off the 12 miles of current for the 4 hours or fails to add the 8º negative compass error.
How to work it out in the exam
- Plot 3′ E of Almina, lay off 12 miles (4 h at 3 knots) along 225º and join to Algeciras: Rv = 356º.
- With Ct = −3º − 5º = −8º, compute Ra = 356º + 8º = 004º.
Where this question comes from
- Junta de Andalucía · 2020 · 3ª convocatoria · PY Módulo de navegación · question 14 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.