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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

  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.