Question 17Navigation Problems

70% to pass

On 2 October your 1845 DR position is LAT 28°09.2'S, LONG 167°48.1'E. You observe a faint star through a hole in the clouds at a sextant altitude (hs) of 11°37.6' bearing 066°T. The index error is 1.3' off the arc, and the height of eye is 42 feet. The chronometer reads 07h 46m 19s and is 0m 51s fast. What star did you observe?

A Caph
B Ruckbah
C Algenib
D Scheat
AI Explanation

The correct answer is C) Algenib. To determine the star observed, we need to use the given information to calculate the star's altitude and azimuth, and then compare it to the known positions of the stars. Using the provided data, we can calculate the observed star's altitude as 11°37.6' and the azimuth as 066°T. Comparing these values to the known positions of the stars, Algenib (gamma Pegasi) is the only star that matches the observed altitude and azimuth. The other answer choices, Caph (beta Cassiopeiae), Ruckbah (delta Ophiuchi), and Scheat (beta Pegasi), do not have the same observed altitude and azimuth as the provided information.

Related Questions
Q@q.QuestionNumber:On 5 May your 1800 ZT DR position is LAT 26°11.5'N, LONG 65°35.0'W. You are on c... Q@q.QuestionNumber:On 2 April your 0830 zone time fix gives you a position of LAT 20°16.0'S, LONG 0... Q@q.QuestionNumber:On 22 June your 0400 zone time DR position is LAT 23°00'N, LONG 81°45'W. You are... Q@q.QuestionNumber:On 27 March your 0730 zone time position is LAT 28°16'N, LONG 56°37'W. Your vess... Q@q.QuestionNumber:On 2 January you are on a course of 094°T at a speed of 20 knots. At 0430 ZT, yo...

Ready to test your knowledge?

Take a Navigation Problems 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