Question 1744Navigation General

70% to pass

Your longitude is 124°E, and your local mean time is 0520 on the 5th of the month. The mean time and date at Greenwich is _______________.

A 1336 on the 5th
B 2104 on the 5th
C 1336 on the 4th
D 2104 on the 4th
AI Explanation

The correct answer is D) 2104 on the 4th. To determine the correct answer, we need to calculate the time difference between your longitude (124°E) and the Greenwich Mean Time (GMT). Since your longitude is east of the prime meridian, you are ahead of GMT. The time difference is 124°E / 15° per hour = 8.27 hours, which rounds to 8 hours. Therefore, your local mean time of 0520 on the 5th corresponds to a GMT time of 2104 (8.27 hours earlier) on the 4th. The other options are incorrect because they do not properly account for the time difference between your location and GMT.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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