Question 1668Navigation General

70% to pass

The navigator aboard a ship at approximately 165°E longitude observes the Sun at ZT 14-25-04 on 21 September. What is the GMT and Greenwich date of the observation?

A 03-25-04, 21 September
B 01-25-04, 21 September
C 02-25-04, 21 September
D 01-25-04, 20 September
AI Explanation

The correct answer is A) 03-25-04, 21 September. The key to determining the correct answer is to calculate the Greenwich Mean Time (GMT) of the observation, based on the given local time and longitude. Since the ship's location is at approximately 165°E longitude, the local time is ahead of GMT by 11 hours (165°E / 15° per hour = 11 hours). Therefore, the GMT of the observation is 03-25-04, which corresponds to 21 September. The other options are incorrect because they do not properly account for the time zone difference between the ship's location and GMT.

Related Questions
Q@q.QuestionNumber:What is TRUE of the history display of a target's past positions on an ARPA? ... Q@q.QuestionNumber:You are on course 222°T and take a relative bearing of a lighthouse of 025°. Wha... Q@q.QuestionNumber:What is the equivalent of 4°36' in time units? Q@q.QuestionNumber:In the Northern Hemisphere, gusty winds shifting clockwise, a rapid drop in temp... Q@q.QuestionNumber:The standard magnetic compass heading differs from the true heading by _________...

Ready to test your knowledge?

Take a Navigation General Practice Exam
Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App