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A HRB: 15:30 en situación GPS l: 36º 03‘N L: 005º 13´ W existiendo un viento del Oeste (W) que nos abate 10º, damos rumbo a la luz verde del puerto de Ceuta (Fl G5s10M) siendo la corrección total = (-5,5º). Calcular Rumbo de aguja a Ceuta.At HRB 15:30 in GPS position l: 36º 03' N, L: 005º 13' W with a West wind causing 10º leeway, you set course for Ceuta port green light (Ct = –5.5º). Calculate your compass course to Ceuta:
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Correct answer: b) Ra = 221.5º
Why it is correct
From 36º 03′ N, 005º 13′ W to Ceuta green port light (35º 53.8′ N, 005º 18.6′ W) the charted surface course is Rs = 206º. With a West wind on the starboard side (10º port leeway), you must head 10º into the wind: Rv = 206º + 10º = 216º. With Ct = −5.5º, compass course is Ra = 216º − (−5.5º) = 221.5º.
Why the others are not
- a) Subtracts instead of adding 10º to offset the West wind or misapplies Ct = −5.5º.
- c) Subtracts instead of adding 10º to offset the West wind or misapplies Ct = −5.5º.
- d) Subtracts instead of adding 10º to offset the West wind or misapplies Ct = −5.5º.
How to work it out in the exam
- Measure on the chart the direct course to Ceuta green light: Rs = 206º.
- Offset the West wind (Rv = 206º + 10º = 216º) and apply Ct = −5.5º: Ra = 221.5º.
Where this question comes from
- Región de Murcia · 2025 · 1ª convocatoria · PY Tipo 1 · question 33 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.