General Navigation USCG Question #1372 (Set 43)

Some locations maintain a zone time of -13. What are the Greenwich time and date if the zone time and date are 0152, 10 January?

Official USCG Answer & Rule Citation

Correct Answer: Option A — 1252, 9 January

To find Greenwich Mean Time from a negative zone time (-13), add 13 hours to the zone time. Crossing midnight backward adjusts the calendar date back by one day, yielding 1252, 9 January.

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