On 24 March your vessel is enroute from Cadiz to... - USCG Navigation Problems

On 24 March your vessel is enroute from Cadiz to Norfolk. Evening twilight will occur at 1830 zone time and your vessel's DR position will be LAT 35°06' N, LONG 60°48' W. Considering their azimuth, altitude, and magnitude, which group of stars is best suited for plotting a star fix at star time?

A Sirius, Dubhe, Mirfak

B Regulus, Denebola, Alkaid

C Adhara, Procyon, Alphard

D Adhara, Rigel, Suhail

AI Explanation

The correct answer is A) Sirius, Dubhe, Mirfak. This group of stars is best suited for plotting a star fix at the given time and position because: 1) Sirius, Dubhe, and Mirfak will be in a favorable position in the sky, with high enough altitudes and good azimuth separation to provide an accurate three-star fix. 2) The other answer choices do not include stars that will be as well-positioned for a star fix at the given latitude, longitude, and time of day. The other options are not as suitable because the stars may be too low on the horizon or too close together in azimuth to provide a reliable three-star fix at the specified location and time.

Question 84Navigation Problems

On 24 March your vessel is enroute from Cadiz to Norfolk. Evening twilight will occur at 1830 zone time and your vessel's DR position will be LAT 35°06' N, LONG 60°48' W. Considering their azimuth, altitude, and magnitude, which group of stars is best suited for plotting a star fix at star time?