On 13 November your 1030 ZT DR position is LAT 19° 03' S, LONG 6° 34' E. You are on course 164° T, speed 12 knots. Determine your 1200 position using the following observations of the Sun. ZONE TIME GHA DECLINATION Ho 1112 351° 55.4' S 18° 00.4' 88° 08.0' 1121 354° 10.4' S 18° 00.5' 88° 33.9'
• Running fix using two Sun lines of position (LOPs) at different times • Advancing and retarding LOPs based on course and speed made good between observations • Using DR (dead reckoning) to carry your position from 1030 ZT to the times of each observation and then to 1200 ZT
• How far (in nautical miles) do you travel between 1030 and each observation time, and in what direction on the plotting sheet? • Once you plot each LOP at its correct time, how do you advance/retard one LOP so both apply to a common time to obtain a running fix? • After you obtain a running fix time, how do you project that position along your course and speed to reach the 1200 ZT position?
• Convert each time interval (minutes) to hours correctly before multiplying by 12 knots (speed) • Make sure all distance advances/retards are laid out along course 164° T (not along the LOPs) • After plotting, compare your final position’s latitude and longitude sense (farther south/north and east/west) with the DR track to see which option is most reasonable.
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