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A HRB: 16:00 estamos en situación 36º 04,0′ N, 006º 00,0′ W. Navegamos a 6 nudos al rumbo de aguja 240º. Tenemos una corriente de Rc = NW e Ihc = 3′ y sopla viento del SE que nos produce un abatimiento de 10º. Declinación magnética = 3º NW y desvío de la aguja = +8º (más). Calcular la situación de estima al ser HRB = 18:00.At ship’s clock 16:00 we are at 36º 04.0′ N, 006º 00.0′ W. We sail at 6 knots on compass course 240º. There is a current setting NW at 3 miles an hour and a SE wind giving 10º of leeway. Variation = 3º NW and deviation = +8º (plus). Calculate the dead reckoning position at 18:00.
Show the answer
Correct answer: d) 36º 05.1′ N 006º 19.6′ W
Why it is correct
True 245º. The SE wind is to port: 255º. 12 miles and 6 of current NW. Arrival: 36º 05.1′ N, 006º 19.6′ W.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- c) 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 · Convocatoria de e · PY Módulo de navegación · question 15 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.