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- Q127 - Navigation Problems: Oceans
77. On 13 October your 0515 zone time fix gives you a position of LAT 26°53.0'N, LONG 90°05.0'W. Your vessel is on course 068°T, and your speed is 7.8 knots. Local apparent noon (LAN) occurs at 1145 zone time, at which time a meridian altitude of the Sun's lower limb is observed. The observed altitude (Ho) for this sight is 54°51.5'. What is the latitude at 1200 ZT?
The latitude at 1200 ZT is determined by calculating the latitude at Local Apparent Noon (LAN) using the Sun's observed altitude and declination, then advancing that latitude based on the vessel's northerly run between LAN and 1200 ZT, considering the course and speed.
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