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- Q127 - Navigation Problems: Oceans
22. Your 0830 DR position is LAT 27°33'S, LONG 79°17'E. Your vessel is on a course of 066°T, at a speed of 19.5 knots. Determine the time of LAN on 10 December.
To determine the time of Local Apparent Noon (LAN), advance the DR position to the approximate time of meridian passage, then use the Nautical Almanac to find the Sun's Greenwich Hour Angle (GHA) corresponding to the longitude at that advanced position.
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