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Sabiendo que nuestra embarcación a Hrb 12:00 está a 5 millas de Cabo Espartel, tomamos demora verdadera de Punta Malabata Dv=94º. Sabiendo que a esta hora estábamos al Oeste del Cabo Espartel, se pide cuál es la situación a las 12:00 h.At Hrb 12:00, located West of Cape Spartel at a distance of 5 miles from Cape Spartel with Punta Malabata bearing Dv = 094º, what is your position?
Show the answer
Correct answer: c) l = 35º 50.1' N; L = 006º 00.7' W.
Why it is correct
Plotting the reciprocal bearing 274º from Punta Malabata (35º 48.8′ N, 005º 45.0′ W) and intersecting it west of Cape Spartel (35º 47.5′ N, 005º 55.5′ W) with a 5-mile arc centred on Spartel gives l = 35º 50.1′ N, L = 006º 00.7′ W.
Why the others are not
- a) Does not match the intersection west of Cape Spartel between the 5′ arc and Dv(Malabata) = 094º.
- b) Does not match the intersection west of Cape Spartel between the 5′ arc and Dv(Malabata) = 094º.
- d) Does not match the intersection west of Cape Spartel between the 5′ arc and Dv(Malabata) = 094º.
How to work it out in the exam
- Plot the reciprocal bearing 274º from Punta Malabata lighthouse.
- Intersect it west of Spartel with a 5-mile arc from Cape Spartel: 35º 50.1′ N, 006º 00.7′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · PER Test 2 · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.