Spanish original · English

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El día 16 de Marzo de 2025 la goleta “Tramuntana” se encuentra en las proximidades de la boya de recalada del puerto de Acapulco en coordenadas l: 16º 45`N L: 099º 55´W poniendo rumbo a un punto de las islas Fiyi de coordenadas l: 17º 40`N L: 178º 55`E. Calcular rumbo ortodrómico inicial en circulares.On 16 March 2025 the schooner “Tramuntana” is near the landfall buoy of Acapulco at l: 16º 45`N L: 099º 55´W, setting course for a point in Fiji at l: 17º 40`N L: 178º 55`E. Calculate the initial great circle course in circular notation.

Show the answer

Correct answer: d) Ri = 284.8º

Why it is correct

The great circle first climbs north: initial course 284.8º.

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

  1. tan R = sin ΔL / (cos l1 tan l2 − sin l1 cos ΔL).
  2. Convert the result to circular by the direction of travel.

Where this question comes from

Try it: Sight reduction

Pending instructor review. Machine translation, not reviewed.