Hover or tap underlined Spanish terms to see their translation and exam tip.
A HRB = 15:00 navegando al rumbo verdadero = 075º y velocidad del buque 7 nudos nos encontramos al Norte verdadero del Faro de Cabo Espartel. Al ser HRB = 16:00 tomamos demora verdadera al Faro de Punta Malabata 160º. Calcular la situación al ser HRB = 16:00.At HRB 15:00 steering Rv = 075º at 7 knots you cross due North true of Cape Spartel lighthouse, and at HRB 16:00 you take true bearing Dv Punta Malabata = 160º. Calculate your position at HRB 16:00:
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Correct answer: b) 35º 54.0' N 005º 47.0' W
Why it is correct
At 15:00 we are on the meridian of Cape Spartel lighthouse (true bearing 180º / reciprocal 000º from 35º 47.5′ N, 005º 55.5′ W). In 1 hour (15:00 to 16:00) at 7 knots we run 7 miles along Rv = 075º; advancing the Spartel meridian 7 miles along 075º to intersect bearing Dv(Malabata) = 160º (reciprocal 340º) gives 35º 54.0′ N, 005º 47.0′ W.
Why the others are not
- a) Does not advance the north-south line through Spartel 7 miles along Rv = 075º to intersect Dv(Malabata) = 160º.
- c) Does not advance the north-south line through Spartel 7 miles along Rv = 075º to intersect Dv(Malabata) = 160º.
- d) Does not advance the north-south line through Spartel 7 miles along Rv = 075º to intersect Dv(Malabata) = 160º.
How to work it out in the exam
- Plot the meridian of Cape Spartel (000º) and advance it 7 miles (1 h at 7 knots) along Rv = 075º.
- Intersect the transferred line with 340º from Punta Malabata: 35º 54.0′ N, 005º 47.0′ W.
Where this question comes from
- Junta de Andalucía · 2018 · 1ª convocatoria · PY Módulo de navegación B · question 17 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.