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A HRB = 19:00 del 20 de marzo de 2023, nos encontramos en situación 39° 33′ N, 000° 12′ W. Navegamos a 7 nudos a los siguientes rumbos durante los tiempos que se indican: Rv = 135°, durante 2 horas Rv = 090°, durante 4 horas Rv = 075°, durante 3 horas A partir de HRB = 22:00 del 20 de marzo de 2023, entramos en zona de corriente de Rc = SW e Intensidad horaria = 3 millas, que se mantiene constante hasta el fin de la navegación. Calcular la situación a HRB = 04:00 del 21 marzo de 2023.At ship’s clock 19:00 on 20 March 2023, we are at 39° 33′ N, 000° 12′ W. We sail at 7 knots: true course 135° for 2 hours, 090° for 4 hours, 075° for 3 hours. From 22:00 on 20 March we enter a current setting SW at 3 miles an hour, constant to the end. Calculate the position at 04:00 on 21 March 2023.
Show the answer
Correct answer: d) 39° 15.8′ N, 000° 46.9′ E
Why it is correct
Legs of 14, 28 and 21 miles. The current acts for just 6 hours: 18 miles SW. Total: 17.2′ S and 45.5′ E. It crosses Greenwich to 39º 15.8′ N, 000º 46.8′ E.
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 · 2023 · 1ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.