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A HRB = 18:15 nos encontramos en situación 36º 05,0´ N, 006º 10,0´W. Navegamos a 6 nudos al rumbo verdadero 160º, con viento del este (E) que nos abate 10º, y nos afecta una corriente de Rumbo corriente = SW e Intensidad Horaria = 3 millas. Calcular situación de estima a las 20:45.At ship’s clock 18:15 we are at 36º 05.0´ N, 006º 10.0´W. We sail at 6 knots on true course 160º, with an easterly wind giving 10º of leeway and a current setting SW at 3 miles an hour. Calculate the dead reckoning position at 20:45.

Show the answer

Correct answer: d) 35º 45.0′ N, 006º 13.5′ W

Why it is correct

The east wind is to port: course through the water 170º. 15 miles at 170º and 7.5 of current at 225º. Total: 20.1′ S and 2.7′ W. Arrival: 35º 44.9′ N, 006º 13.3′ W, very close to d.

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. Break each leg and the current into north-south and east-west.
  2. Add them. 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.