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- Q135 - Navigation Problems: Oceans
675. On 8 April your evening DR position is LAT 22°16.0' N, LONG 157°58.3' W. You observe an unidentified star bearing 238°T at an observed altitude (Ho) of 50°02.7'. The chronometer reads 05h 09m 57s and is 01m 23s slow. What star did you observe?
Sight reduction calculations using the Nautical Almanac and sight reduction tables reveal that only Alnilam produces a computed altitude and azimuth matching the observed values of 5002.7' and 238T, respectively, from the given DR position and time.
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