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Situada una embarcación al 350º verdadero y a 5 millas del faro de Punta Malabata, se emprende a las 16 horas 18 minutos navegación con rumbo verdadero 307º con una velocidad de 12 nudos. Calcular la situación de estima a las 17 horas 8 minutos.From a point 5 miles on true bearing 350º from Punta Malabata lighthouse, you sail at 16h 18m on true course 307º at 12 knots. Calculate your DR position at 17h 08m:
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Correct answer: d) l = 36º 00.2' N L = 005º 55.8' W
Why it is correct
At 5 miles along 350º true from Punta Malabata (35º 48.8′ N, 005º 45.0′ W) the start is 35º 53.7′ N, 005º 46.1′ W. From 16:18 to 17:08 (50 minutes at 12 knots) you run 10 miles along Rv = 307º, reaching l = 36º 00.2′ N, L = 005º 55.8′ W.
Why the others are not
- a) Does not match the position reached after running 10 miles on Rv = 307º.
- b) Does not match the position reached after running 10 miles on Rv = 307º.
- c) Does not match the position reached after running 10 miles on Rv = 307º.
How to work it out in the exam
- Plot the start 5 miles along 350º true from Punta Malabata (35º 53.7′ N, 005º 46.1′ W).
- Plot 10 miles (50 min at 12 knots) along Rv = 307º: 36º 00.2′ N, 005º 55.8′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de febrero · PER Test 5 · question 45 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.