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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

  1. Find each leg’s course, with leeway if any.
  2. Break each leg and the current into north-south and east-west, and add them.
  3. Turn departure into longitude: ΔLong = departure / cos(mean latitude).

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.