On 29 April your 0300 ZT DR position is LAT 28°39' N, LONG 168°03' E. You are on course 108°T at a speed of 22 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 B — Moon, Alpheratz, Polaris
Twilight star selection requires bodies distributed across different azimuths with suitable altitudes and magnitudes for an accurate fix. Group B, featuring the Moon, Alpheratz, and Polaris, offers optimal spatial geometry and brightness for a reliable three-body fix at star time.
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