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Desde la situación 34° 22,0′ N, 179° 45,0′ E navegamos a los siguientes rumbos a 8 nudos de velocidad: Rumbo verdadero = 090º durante 3 horas Rumbo verdadero = 155º durante 2 horas Durante toda la navegación nos afecta una corriente, Rumbo corriente = Sur e Intensidad horaria = 3 millas. Calcular la situación de llegada.From 34° 22.0′ N, 179° 45.0′ E we sail at 8 knots on these courses: True course 090º for 3 hours; True course 155º for 2 hours. Throughout, a current sets South at 3 miles an hour. Calculate the arrival position.
Show the answer
Correct answer: c) 33º 52.5´ N 179º 37.8´W
Why it is correct
Legs: 24 miles at 090º, 16 miles at 155º and 15 miles of current south. Total: 29.5′ S and 30.8′ E. It crosses the 180º meridian and arrives at 179º 37.8′ 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
- Break each leg and the current into north-south and east-west.
- Add them. Turn departure into longitude: ΔLong = departure / cos(mean latitude).
Where this question comes from
- Junta de Andalucía · 2024 · 3ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.