Question 73Navigation Problems

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On 16 July your 1810 zone time DR position is LAT 24°16.5' S, LONG 162°52.0' E. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?

A Arcturus, Spica, Antares
B Vega, Hadar, Venus
C Pollux, Mars, Deneb
D Jupiter, Alphard, Alphecca
AI Explanation

The correct answer is D) Jupiter, Alphard, Alphecca. At the given position (LAT 24°16.5' S, LONG 162°52.0' E) and time (1810 zone time), these three celestial bodies would be best suited for a fix at star time due to their favorable magnitude, azimuth, and altitude. Jupiter would be a good choice as a bright and easily identifiable navigational star, while Alphard and Alphecca would provide additional references for a reliable celestial fix. The other options are not as suitable for this particular position and time. Arcturus, Spica, and Antares (A) would not be as well-positioned, while Vega, Hadar, and Venus (B) or Pollux, Mars, and Deneb (C) may not offer the optimal combination of brightness, altitude, and azimuth for an accurate celestial fix.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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