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En situación l= 35º-46,0 N L= 006º-19,0 W se da rumbo para pasar a 3 millas del Faro de Cabo Espartel. Hay viento de NW que una vez a rumbo abate 6º. Calcular el RvIn position l = 35º 46.0' N, L = 006º 19.0' W you set course to pass 3 miles off Cape Spartel lighthouse with a NW wind causing 6º leeway once on course. Calculate the true course Rv:
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Correct answer: b) Rv = 070º.
Why it is correct
From 35º 46.0′ N, 006º 19.0′ W the tangent to the 3-mile circle north of Cape Spartel lighthouse (35º 47.5′ N, 005º 55.5′ W) gives a surface course Rs = 076º. Since the NW wind comes from port and sets the vessel 6º to starboard, you must steer 6º to port: Rv = 076º − 6º = 070º.
Why the others are not
- a) Does not subtract the 6º leeway from the NW wind from the surface course Rs = 076º.
- c) Does not subtract the 6º leeway from the NW wind from the surface course Rs = 076º.
- d) Does not subtract the 6º leeway from the NW wind from the surface course Rs = 076º.
How to work it out in the exam
- Draw from 35º 46.0′ N, 006º 19.0′ W the tangent 3 miles off Cape Spartel: Rs = 076º.
- Subtract the 6º starboard leeway (NW wind on port side): Rv = 076º − 6º = 070º.
Where this question comes from
- Junta de Andalucía · 2015 · 1ª convocatoria · PY Módulo de navegación · question 12 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.