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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q207 - Navigation Problems: Oceans
70. During twilight on 28 December around 1800 GMT, in DR position LAT 4°00'N, LONG 0°06'W, the sextant altitude (hs) of Venus was 30°46.8'. The height of eye was 36 feet, and the index error was 2.0' on the arc. The temperature was 68°F. The barometer read 1030 mb. Calculate the observed altitude (Ho).
The observed altitude (Ho) is calculated by correcting the sextant altitude for index error, dip, and the Venus altitude correction from the Nautical Almanac, resulting in Ho 3038.1'.
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