Hover or tap underlined Spanish terms to see their translation and exam tip.
Navegando a las 10:22 Hrb, con un Rumbo de aguja= 140° con una declinación magnética de 5°(-) y un desvío de aguja de 4°(+), tomamos demora de aguja a Cabo Trafalgar= 030º y marcación a Punta Camarinal= 45º babor. Situados ponemos rumbo a la luz del espigón de Tánger, con una velocidad de máquinas de 12 nudos. Se pide calcular la posición a las 11:43 Hrb.At 10:22 on Ra = 140° (variation –5°, deviation +4°), you take Da Cape Trafalgar = 030º and M = 45º Port to Punta Camarinal, then head for Tangier breakwater light at 12 knots. Find your position at 11:43:
Show the answer
Correct answer: d) 35° 53.2' N; 005° 53.1' W.
Why it is correct
With Ct = −5º + 4º = −1º, Rv = 139º, Dv(Trafalgar) = 029º and Dv(Camarinal) = 139º − 45º = 094º, fixing us at 10:22 at 36º 05.6′ N, 006º 05.4′ W. In 1h 21m (1.35 h) at 12 knots you run 16.2 miles towards Tangier breakwater to 35º 53.2′ N, 005º 53.1′ W.
Why the others are not
- a) Does not match the position after running 16.2 miles towards Tangier from the 10:22 fix.
- b) Does not match the position after running 16.2 miles towards Tangier from the 10:22 fix.
- c) Does not match the position after running 16.2 miles towards Tangier from the 10:22 fix.
How to work it out in the exam
- Fix the start with Dv(Trafalgar) = 029º and Dv(Camarinal) = 094º (36º 05.6′ N, 006º 05.4′ W).
- Lay course for Tangier breakwater and measure 16.2 miles (81 min at 12 knots): 35º 53.2′ N, 005º 53.1′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · PER Test 2 · question 44 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · PER Test 4 · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.