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Desde la situación 38º 20′ N, 179º 05′ E, damos rumbo a la situación 35º 42′ N, 178º 38′ W. Calcular Rumbo directo (aproximar al medio grado).From 38º 20′ N, 179º 05′ E, we set course for 35º 42′ N, 178º 38′ W. Calculate the direct course (to the nearest half degree).
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Correct answer: b) 145.5º
Why it is correct
It crosses the 180º meridian eastward: ΔLong = 137′. Δlat = 158′ S. Departure = 109′. Course S 34.5º E, or 145.5º.
Why the others are not
- a) It does not match the working.
- c) It does not match the working.
- d) It does not match the working.
How to work it out in the exam
- Find the difference of latitude and the departure: ΔL × cos(mean latitude).
- Course = arctan(A / Δlat). Distance = root of the sum of squares.
Where this question comes from
- Junta de Andalucía · 2020 · 3ª convocatoria · PY Módulo de navegación · question 20 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.