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- Q135 - Navigation Problems: Oceans
58. On 1 July your 0515 zone time fix gives you a position of LAT 23°24.0'S, LONG 151°42.0'W. Your vessel is on course 240°T, and your speed is 10.0 knots. Local apparent noon (LAN) occurs at 1215 zone time, 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 latitude at 1200 ZT?
The latitude at 1200 ZT is determined from the Sun's observed meridian altitude at Local Apparent Noon (LAN). Calculate the zenith distance (Z) as 90 — observed altitude (Ho), then use the formula L = Z — Dec to find the latitude magnitude, considering the ship's hemisphere based on the DR position and declination.
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