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Calcular la situación verdadera de una embarcación que se sitúa a 2,2 millas náuticas del faro del dique del puerto de Tánger en la línea isobática de 50 metros, que observa la luz blanca del faro (de ocultaciones) de El Xarf.At 2.2 nautical miles from Tangier port breakwater lighthouse on the 50-metre depth contour inside the white sector of El Xarf light, what is your true position?
Show the answer
Correct answer: b) l = 35º 49.6' N L = 005º 46.5' W.
Why it is correct
Swinging a 2.2-mile arc centred on Tangier breakwater light (35º 47.4′ N, 005º 48.2′ W), its intersection with the 50-metre depth contour inside the white sector of El Xarf occulting light lies NE of the port at l = 35º 49.6′ N, L = 005º 46.5′ W.
Why the others are not
- a) Does not match the intersection of the 2.2-mile arc from Tangier mole with the 50 m contour in El Xarf white sector.
- c) Does not match the intersection of the 2.2-mile arc from Tangier mole with the 50 m contour in El Xarf white sector.
- d) Does not match the intersection of the 2.2-mile arc from Tangier mole with the 50 m contour in El Xarf white sector.
How to work it out in the exam
- Swing a 2.2-mile arc from Tangier mole lighthouse.
- Find its intersection with the 50 m contour inside El Xarf white sector: 35º 49.6′ N, 005º 46.5′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2020 · Convocatoria de diciembre · PER Test 4 · question 43 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.