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- Q135 - Navigation Problems: Oceans
384. On 8 February your 0800 zone time position is LAT 21°55'S, LONG 52°27'W. Your vessel is on course 056°T at a speed of 17.5 knots. An observation of the Sun's lower limb is made at 0938 zone time, and the observed altitude (Ho) is 46°06.5'. The chronometer reads 12h 37m 23s, and the chronometer error is 1m 24s slow. LAN occurs at 1243 zone time, and a meridian altitude of the Sun's lower limb is made. The observed altitude (Ho) for this sight is 83°56.1'. Determine the vessel's 1200 zone time position.
The correct position at 1200 zone time is determined by reducing a Sun sight at 0938, advancing it to 1200, reducing a meridian altitude at LAN, running that latitude back to 1200, and intersecting the resulting lines of position.
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