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A Hrb= 09:30, salimos desde el extremo del dique exterior del puerto de Barbate navegando al rumbo de aguja 219º, siendo la Ct= –3º. Cuando nos encontramos en la oposición Cabo Trafalgar – Punta Camarinal, ponemos nuevo rumbo para dirigirnos a un punto situado al NNW (337,5º) de Punta Malabata, a una distancia de 11,2 millas, siendo la Ct= +1º. Al encontrarnos al Oeste verdadero de la Isla de Tarifa, ponemos rumbo a la farola del dique exterior del puerto de Tánger, siendo la Ct= +2º. La velocidad del buque durante todo el ejercicio es de 6 nudos. Determinar el rumbo de aguja final y la hora estimada de llegada al espigón del Puerto de Tánger.At 09:30 from Barbate pier head at 6 knots you steer Ra = 219º (Ct = –3º) to the Trafalgar–Camarinal opposition, then towards 11.2' NNW of Malabata (Ct = +1º) until West of Tarifa, then to Tangier (Ct = +2º). Find final Ra and ETA:
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Correct answer: c) Ra = 166º; Hrb = 13:45.
Why it is correct
Leg 1 leaves Barbate on Rv = 219º − 3º = 216º to the Trafalgar–Camarinal opposition; leg 2 heads towards the point 11.2′ NNW (337.5º) of Malabata until crossing the parallel of Tarifa (36º 00.0′ N, 005º 51.0′ W); from there to Tangier breakwater, Rv = 168º (Ra = 168º − 2º = 166º) and total distance (25.5 miles at 6 knots = 4h 15m) gives ETA 13:45.
Why the others are not
- a) Does not match the final compass course Ra = 166º (Rv = 168º, Ct = +2º) and ETA 13:45.
- b) Does not match the final compass course Ra = 166º (Rv = 168º, Ct = +2º) and ETA 13:45.
- d) Does not match the final compass course Ra = 166º (Rv = 168º, Ct = +2º) and ETA 13:45.
How to work it out in the exam
- Plot the three successive legs on the chart and measure the final true course to Tangier: Rv = 168º ⇒ Ra = 168º − 2º = 166º.
- Sum the three leg distances (25.5 miles) and divide by 6 knots (4h 15m): 09:30 + 4h 15m = 13:45.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2026 · Convocatoria de abril · PER Test 2 · question 45 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2026 · Convocatoria de abril · PER Test 4 · question 43 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.