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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q207 - Navigation Problems: Oceans
49. On 5 June your 0420 zone time DR position is LAT 26°47.0' N, LONG 133°19.5' W. At that time, you observe Vega bearing 298.1°psc. The chronometer reads 01h 21m 17s, and the chronometer error is 02m 25s fast. The variation is 3.5°E. What is the deviation of the standard compass?
The true azimuth of Vega (299.8) is east of the observed compass bearing (298.1), resulting in a compass error of 1.7 East. Given a variation of 3.5 East, the deviation is calculated as 1.8 West (1.7 — 3.5).
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