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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

  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.