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- Q135 - Navigation Problems: Oceans
217. On 20 September your 0730 zone time position was LAT 28°58.0'N, LONG 152°26.0'W. Your vessel was steaming on course 225°T at a speed of 19.0 knots. An observation of the Sun's lower limb was made at 0931 ZT. The chronometer read 07h 29m 20s and was slow 02m 22s. The observed altitude (Ho) was 44°14.4'. LAN occurred at 1206 zone time. The observed altitude (Ho) was 62°49.5'. What was the longitude of your 1200 zone time running fix?
The correct longitude of the 1200 zone time running fix is 15323.5'W. This result is obtained by reducing both Sun sights, advancing the first LOP to 1200 ZT along the vessel's course and speed, and retarding the second LOP to the same time.
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