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A HRB= 08h 00m del 21 de noviembre de 2020 nos encontramos en situación 36º 05,0' N, 006º 10,0' W. Calcular la situación al ser HRB = 10h 30m, sabiendo que la velocidad del barco es de 7,2 nudos y el Rumbo verdadero es 110º. La corrección total es +10º (más).At ship’s clock 08h 00m on 21 November 2020 we are at 36º 05.0' N, 006º 10.0' W. Calculate the position at 10h 30m, given that the boat’s speed is 7.2 knots and the true course is 110º. The total correction is +10º (plus).
Show the answer
Correct answer: a) 35º 58.8' N; 005º 49.2' W
Why it is correct
The true course is given, so the total correction is not needed. 2.5 h at 7.2 knots is 18 miles: 6.2′ south and 16.9 miles east, which is 20.9′ of longitude.
Why the others are not
- b) The working gives 35º 58,8′ N, 005º 49,1′ W, and this option does not match.
- c) The working gives 35º 58,8′ N, 005º 49,1′ W, and this option does not match.
- d) The working gives 35º 58,8′ N, 005º 49,1′ W, and this option does not match.
How to work it out in the exam
- Find the true course: true = compass + total correction.
- Distance = speed × time.
- Draw the course on the chart, measure the distance and read the position.
Where this question comes from
- Junta de Andalucía · 2020 · 3ª convocatoria · PER Modelo A · question 43 Official paper · Official answer key
- Junta de Andalucía · 2020 · 3ª convocatoria · PER Modelo B · question 43 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.