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A HRB: 0900 navegando al Rumbo de aguja =246º y 8 nudos de velocidad e máquinas, sin viento ni corriente, se toma demora de aguja al Faro de Punta Europa=286º.Seguimos navegando en las mismas condiciones (mismo rumbo de aguja y velocidad de máquinas) y a HRB 0930 obtenemos demora de aguja faro de Punta Europa = 356º.Correción total para todo el ejercicio= 6º NW. Calcular posición a las HRB 0930.At HRB 0900 steering Ra = 246º at 8 knots without wind or current (Ct = 6º NW), you take Da Punta Europa = 286º; at HRB 0930 you take Da Punta Europa = 356º. Calculate your position at HRB 0930:
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Correct answer: c) l: 36º 04.0' N ; L: 005º 20.0' W
Why it is correct
With Ct = −6º, true course is Rv = 246º − 6º = 240º, the first true bearing to Punta Europa is Dv₁ = 286º − 6º = 280º and the second is Dv₂ = 356º − 6º = 350º. In 30 minutes (09:00 to 09:30) at 8 knots you run 4 miles along 240º; advancing Dv₁ by 4 miles along 240º to intersect Dv₂ gives 36º 04.0′ N, 005º 20.0′ W.
Why the others are not
- a) Does not advance the first bearing Dv₁ = 280º by 4 miles along Rv = 240º to intersect Dv₂ = 350º.
- b) Does not advance the first bearing Dv₁ = 280º by 4 miles along Rv = 240º to intersect Dv₂ = 350º.
- d) Does not advance the first bearing Dv₁ = 280º by 4 miles along Rv = 240º to intersect Dv₂ = 350º.
How to work it out in the exam
- Compute Rv = 240º, Dv₁ = 280º, Dv₂ = 350º and distance run d = 4 miles in 30 min.
- Advance the first bearing line 4 miles along 240º to intersect the second: 36º 04.0′ N, 005º 20.0′ W.
Where this question comes from
- Región de Murcia · 2024 · 3ª convocatoria · PY Tipo 1 · question 37 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.