Navigation Problems USCG Question #1174 (Set 35)

On 10 October your 1500 zone time DR position is LAT 27°35.6' S, LONG 44°49.0' W. You are on course 342°T at a speed of 24 knots. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?

Official USCG Answer & Rule Citation

Correct Answer: Option C — Moon, Al Na'ir, Rigil Kentaurus

Effective celestial fixes require bodies with a wide azimuth spread. The Moon, Al Na'ir, and Rigil Kentaurus offer the best geometric distribution and brightness for the specified Southern Hemisphere location. This selection minimizes the potential for error in the resulting fix, consistent with Bowditch's celestial navigation guidelines.

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