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Día 16 de Abril de 2021. Al amanecer zarpan de Nassau y a hora del reloj de bitácora (HRB) arreglada a la hora de huso (Hz)= 08:00, se encuentran en el punto de salida –A- 25º 42,1´N – 076º 42,4´W y el Capitán calcula el día y la hora civil en Greenwich (HcG) en ese instante:On 16 April 2021 at dawn, departing Nassau at ship's clock set to zone time (Hz) = 08:00 from point A (25º 42.1' N, 076º 42.4' W), calculate the Greenwich civil time (HcG) and date:
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Correct answer: b) HcG = 13:00 on the 16th
Why it is correct
Longitude 076º 42.4′ W lies in zone +5 W (76.7º / 15 = 5.1). Adding 5 hours to 08:00 on the 16th gives HcG = 13:00 on the 16th.
Why the others are not
- a) Subtracts 5 hours and changes the date to the next day.
- c) Adds 5 hours but advances a day without crossing midnight.
- d) Subtracts 5 hours and steps back to the previous day.
How to work it out in the exam
- In zone +5 W, HcG = Hz + 5h.
Where this question comes from
- Región de Murcia · 2021 · 1ª convocatoria · CY Tipo 1 · question 13 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.