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A HRB: 13:00 estamos en situación 35º 50,0′ N, 006º 20,0′ W. Navegamos a 6 nudos al rumbo de aguja 089º. Tenemos una corriente de Rc = SE e Ihc = 3′ y sopla viento del NW que nos produce un abatimiento de 10º. Declinación magnética = 3º NW y desvío de la aguja = –6º (menos). Calcular la situación de estima al ser HRB = 14:30.At ship’s clock 13:00 we are at 35º 50.0′ N, 006º 20.0′ W. We sail at 6 knots on compass course 089º. There is a current setting SE at 3 miles an hour and a NW wind giving 10º of leeway. Variation = 3º NW and deviation = –6º (minus). Calculate the dead reckoning position at 14:30.
Show the answer
Correct answer: a) 35º 47.0′ N 006º 05.0′ W
Why it is correct
True 080º. The NW wind is to port: 090º. 9 miles east and 4.5 of current SE. Arrival: 35º 46.8′ N, 006º 05.0′ W.
Why the others are not
- b) It does not match the working.
- c) It does not match the working.
- d) It does not match the working.
How to work it out in the exam
- Find each leg’s course, with leeway if any.
- Break each leg and the current into north-south and east-west, and add them.
- Turn departure into longitude: ΔLong = departure / cos(mean latitude).
Where this question comes from
- Junta de Andalucía · 2020 · 3ª convocatoria · PY Módulo de navegación · question 15 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.