Coast Guard Exams
Question 95Navigation Problems70% to pass

On 28 October morning twilight will occur around 0524 ZT. Your DR position is LAT 25°25.0' N, LONG 32°33.3' W. Considering their magnitude and location, which group will be the three stars best suited to observe for a star fix at star time?

AI Explanation
The correct answer is C) Sirius, Capella, Denebola. This is the correct answer because these three stars are best suited for a star fix at the given time and location. Sirius is a very bright star that will be visible in the southern part of the sky. Capella is a bright star in the northern part of the sky, and Denebola is a moderately bright star in the eastern part of the sky. Together, these three stars provide a good geometric spread to obtain an accurate star fix. The other options are incorrect because they do not provide as favorable a geometric spread for the star fix. Hamal and Dubhe are not as well-positioned as Capella and Denebola, and Mirfak is not as bright as Capella.

Related Questions

#93 On 4 January your 0800 zone time DR position is LAT 25°25.0 S, LONG 16°09.0'W. Your vessel is on course 290°T at a speed of 13.5 knots. What is the zone time of local apparent noon (LAN)?#94 On 11 November your 0200 zone time DR position is LAT 26°32' S, LONG 154°16' E. You are on course 058°T at a speed of 21 knots. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?#96 On 17 May at 0501 zone time, morning stars were observed, and the vessel's position was determined to be LAT 22°16.0'S, LONG 103°46.0'W. Your vessel is steaming at 24.0 knots on a course of 301°T. A sextant observation of the Sun's lower limb is made at 0845 zone time. The chronometer reads 03h 43m 32s, and the sextant altitude is 28°24.7'. The index error is 1.5' off the arc, and the chronometer error is 02m 02s slow. Your height of eye on the bridge is 85.5 feet. What is the azimuth (Zn) of this sight using the assumed position?#97 On 14 January your 0550 DR position is LAT 25°26.0'N, LONG 38°16.0'W. You observe an unidentified star bearing 212°T at an observed altitude (Ho) of 41°42.3'. The chronometer reads 08h 48m 51s, and is 01m 22s slow. What star did you observe?#98 On 23 July your 1700 zone time DR position is LAT 27°29' N, LONG 129°26' W. You are on course 079°T at a speed of 20 knots. Considering their magnitude, azimuth, and altitude, which group includes the three bodies best suited for a fix at star time?

Ready to test your knowledge?