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- Q135 - Navigation Problems: Oceans
363. On 6 April your 0300 DR position is LAT 27° 42' S, LONG 128° 58' W. You are on course 097° T at a speed of 18 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix. ZONE OBSERVED BODY TIME GHA ALTITUDE (Ho) DECLINATION ------------------- -------- ------------- ------------ --------------- Fomalhaut 0530 203° 08.6' 25° 17.5' S 29° 43.4' Rigil Kent. 0536 194° 12.4' 35° 26.6' S 60° 45.3' Vega 0540 135° 43.2' 23° 06.8' N 38° 45.7'
The 0600 running fix is determined by advancing the DR and reducing celestial observations to lines of position, which are then advanced to 0600 and intersected. Answer B (27 44.7' S, 127 47.5' W) is the only position consistent with the sight data, the DR track, and the geometry of the lines of position, representing a small, plausible correction to the DR.
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