Hover or tap underlined Spanish terms to see their translation and exam tip.
Navegamos a 7 nudos al rumbo verdadero 160º. Tenemos una corriente de Rc = E e Ihc = 3′ y sopla viento del W que nos produce un abatimiento de 15º. A HRB = 12:00 nos encontramos en situación 36º 10,0′ N, 006º 10,0′ W. Calcular la situación de estima al ser HRB = 14:30.We sail at 7 knots on true course 160º. There is a current setting E at 3 miles an hour and a W wind giving 15º of leeway. At ship’s clock 12:00 we are at 36º 10.0′ N, 006º 10.0′ W. Calculate the dead reckoning position at 14:30.
Show the answer
Correct answer: c) 35º 55.7′ N 005º 48.3′ W
Why it is correct
The west wind is to starboard: 160º − 15º = 145º. 17.5 miles and 7.5 of current east. Arrival: 35º 55.7′ N, 005º 48.3′ W.
Why the others are not
- a) It does not match the working.
- b) 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 · 2022 · 2ª convocatoria · PY Módulo de navegación · question 15 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.