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A HRB =12-00 navegando al Ra = 072º, dm = 3º NW, Desvío = 8º NE se marca el Faro de Cabo Espartel 70º Estribor y simultáneamente distancia del mismo Faro 5 millas. Calcular la situación a HRB = 12-00.At HRB = 12-00 steering Ra = 072º (variation 3º NW, deviation 8º NE), Cape Spartel lighthouse bears 70º Starboard relative at a distance of 5 miles. Find your position:
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Correct answer: b) l = 35º-51.8' N, L = 005º-58.8' W
Why it is correct
With Ct = −3º + 8º = +5º, true course is Rv = 072º + 5º = 077º. True bearing to Cape Spartel is Dv = 077º + 70º = 147º (reciprocal 327º from the light). Measuring 5 miles along 327º from Spartel gives l = 35º 51.8′ N, L = 005º 58.8′ W.
Why the others are not
- a) Does not match measuring 5 miles along 327º true from Cape Spartel.
- c) Does not match measuring 5 miles along 327º true from Cape Spartel.
- d) Does not match measuring 5 miles along 327º true from Cape Spartel.
How to work it out in the exam
- Compute Ct = +5º, Rv = 077º and Dv(Spartel) = 077º + 70º = 147º (reciprocal 327º).
- Measure 5 miles along 327º from Cape Spartel: 35º 51.8′ N, 005º 58.8′ W.
Where this question comes from
- Junta de Andalucía · 2015 · 2ª convocatoria · PER Modelo A · question 42 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.