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- Q135 - Navigation Problems: Oceans
59. On 1 July your 0515 ZT fix gives you a position of LAT 24°36.0'S, LONG 151°42.0'W. Your vessel is on course 300°T, and your speed is 10.0 knots. Local apparent noon (LAN) occurs at 1215 ZT, at which time a meridian altitude of the Sun's lower limb is observed. The observed altitude (Ho) for this sight is 42°55.0'. What is the calculated latitude at LAN?
The calculated latitude at LAN is 2401.0'S, determined by running a dead reckoning from the initial position to LAN, accounting for speed, time, and course, and confirmed by applying the noon sight formula using the observed altitude and the Sun's declination.
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