Question 87Navigation Problems

70% to pass

On 12 September your 0600 zone time (ZT) fix gives you a position of LAT 22°51.9'N, LONG 133°40.1'W. Your vessel is on course 062°T, and your speed is 12.3 knots. Local apparent noon (LAN) occurs at 1142 ZT, at which time a meridian altitude of the Sun's upper limb is observed. The observed altitude (Ho) for this sight is 70°33.2'. What is the calculated latitude at LAN?

A 23°24.8'N
B 23°26.5'N
C 23°27.9'N
D 23°23.0'N
AI Explanation

The correct answer is A) 23°24.8'N. This is determined by using the information provided to calculate the vessel's position at local apparent noon (LAN). The initial fix at 0600 zone time, the course and speed, and the observed meridian altitude of the sun at LAN are used to find the latitude at LAN. The other options are incorrect because they do not match the calculated latitude based on the given information. Option B) 23°26.5'N, Option C) 23°27.9'N, and Option D) 23°23.0'N are not the correct latitude at LAN.

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