Hover or tap underlined Spanish terms to see their translation and exam tip.
Un buque se encuentra en situación 15º 00,0′ N, 179º 15,0′ E y navega con velocidad 10 nudos a los siguientes rumbos: Rumbo 120º durante 3 horas. Rumbo E (este) durante 4 horas. Rumbo 150º durante 6 horas. Calcular la situación de llegada.A ship at 15º 00.0′ N, 179º 15.0′ E sails at 10 knots: Course 120º for 3 hours. Course E (east) for 4 hours. Course 150º for 6 hours. Calculate the arrival position.
Show the answer
Correct answer: c) 13º 53.0′ N 179º 05.9′ W
Why it is correct
30 miles at 120º, 40 east and 60 at 150º. Total: 67′ S and 96′ E. It crosses the 180º meridian to 13º 53′ N, 179º 05.9′ W.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- d) 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 · 2020 · Convocatoria de e · PY Módulo de navegación · question 20 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.