Navigation Problems USCG Question #1 (Set 1)

On 2 February your 0400 zone time DR position is LAT 24°14.0' N, LONG 163°28.0' W. You are on course 322°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 A — Saturn, Antares, Rasalhague

According to Bowditch, star selection for a reliable fix requires bodies spaced approximately 120 degrees apart in azimuth with moderate altitudes between 15° and 65°. This minimizes geometric intersection errors and refraction anomalies during twilight observations.

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