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Situados en l=36º15’N, L=006º15’W, damos rumbo a pasar a 5 millas al SW verdadero del faro de cabo Trafalgar, con viento Norte que nos abate 5º, corrección total Ct=-7º. - Hallar el Rumbo de aguja, Ra.In position l = 36º 15' N, L = 006º 15' W you set course to pass 5 miles SW true of Cape Trafalgar lighthouse with a North wind causing 5º leeway and Ct = –7º. Find the compass course Ra:
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Correct answer: b) Ra = 139º
Why it is correct
The point 5 miles SW true (225º) of Cape Trafalgar lighthouse (36º 11.0′ N, 006º 02.0′ W) is 36º 07.5′ N, 006º 06.4′ W. Joining 36º 15′ N, 006º 15′ W to that point gives Rs = 137º. With a North wind on the port side (+5º starboard leeway), head 5º to port: Rv = 137º − 5º = 132º. With Ct = −7º, Ra = 132º + 7º = 139º.
Why the others are not
- a) Does not subtract the 5º starboard leeway or fails to add the 7º negative compass error.
- c) Does not subtract the 5º starboard leeway or fails to add the 7º negative compass error.
- d) Does not subtract the 5º starboard leeway or fails to add the 7º negative compass error.
How to work it out in the exam
- Plot the point 5′ SW of Trafalgar and measure Rs = 137º from 36º 15′ N, 006º 15′ W.
- Offset the North wind (Rv = 137º − 5º = 132º) and apply Ct = −7º: Ra = 139º.
Where this question comes from
- Región de Murcia · 2026 · 2ª convocatoria · PY Tipo 1 · question 34 Official paper · Official answer key
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