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A HRB= 1424 Navegan proa a la corriente general de la zona (Rc= 112º e Intensidad horaria de la corriente= 2 nudos) manteniendo los 8 nudos de velocidad de corredera y en ese instante el radar les indica que tienen el faro de Cabo Espartel por la demora verdadera= 160º y a 12,2 millas de distancia y sitúan la posición en la carta:At HRB 1424 steaming into the current (Rc = 112º, Ihc = 2 knots) at 8 knots log speed, radar shows Cape Spartel lighthouse at true bearing Dv = 160º and distance 12.2 miles. Plot your position at 1424:
Show the answer
Correct answer: c) 35º 59.0' N - 006º 00.5' W
Why it is correct
True bearing to Cape Spartel lighthouse is Dv = 160º, so from the lighthouse (35º 47.5′ N, 005º 55.5′ W) you plot the reciprocal bearing 340º and measure the 12.2-mile radar distance along it, directly obtaining 35º 59.0′ N, 006º 00.5′ W.
Why the others are not
- a) Does not match the point 12.2 miles along the reciprocal bearing 340º from Cape Spartel.
- b) Does not match the point 12.2 miles along the reciprocal bearing 340º from Cape Spartel.
- d) Does not match the point 12.2 miles along the reciprocal bearing 340º from Cape Spartel.
How to work it out in the exam
- Plot from Cape Spartel lighthouse the reciprocal bearing: 160º + 180º = 340º.
- Measure 12.2 miles along that line: 35º 59.0′ N, 006º 00.5′ W.
Where this question comes from
- Región de Murcia · 2021 · 2ª convocatoria · PY Tipo 1 · question 36 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.