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Al ser HRB 11:00 nos encontramos en situación 36º 05′ N y 006º 00′ W, navegando al rumbo verdadero 110º con velocidad 8 nudos. Sopla viento del NE, que nos produce un abatimiento de 20º. Calcular la situación de estima al tener por el través el faro de punta Camarinal.At HRB 11:00 in position 36º 05' N, 006º 00' W steering true course 110º at 8 knots with a NE wind causing 20º leeway, calculate your DR position when Punta Camarinal lighthouse is abeam:
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Correct answer: a) 35º 59.2' N 005º 51.4' W
Why it is correct
With true heading Rv = 110º and a NE wind on the port side (+20º starboard leeway), the surface track is Rs = 110º + 20º = 130º. When Punta Camarinal lighthouse is abeam to port (90º from true heading Rv = 110º), true bearing to Camarinal is Dv = 110º − 90º = 020º (reciprocal 200º from Camarinal), which intersects Rs = 130º at 35º 59.2′ N, 005º 51.4′ W.
Why the others are not
- b) Takes the beam bearing perpendicular to Rs = 130º instead of perpendicular to heading Rv = 110º.
- c) Takes the beam bearing perpendicular to Rs = 130º instead of perpendicular to heading Rv = 110º.
- d) Takes the beam bearing perpendicular to Rs = 130º instead of perpendicular to heading Rv = 110º.
How to work it out in the exam
- Plot from 36º 05′ N, 006º 00′ W the surface course Rs = 110º + 20º = 130º.
- Intersect it with the abeam bearing relative to heading (Dv = 110º − 90º = 020º, reciprocal 200º from Camarinal): 35º 59.2′ N, 005º 51.4′ W.
Where this question comes from
- Junta de Andalucía · 2022 · 3ª convocatoria · PY Módulo de navegación · question 15 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.