On 25 August your 1926 zone time DR position...

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Question 1 of 2066636eea28f7522a1c51ad99

On 25 August your 1926 zone time DR position is LAT 24° 17.0' S, LONG 05° 47.0' W. At that time, you observe Fomalhaut bearing 117° psc. The chronometer reads 07h 26m 52s, and the chronometer error is 00m 15s fast. The variation is 1.5° E. What is the deviation of the standard magnetic compass?

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🔍 Key Concepts

• Azimuth (bearing) of a star and how it’s used to find compass error • Relationship between true bearing, magnetic bearing, and compass bearing • Applying variation and solving for deviation from the compass error formula

💭 Think About

• How do you get the true azimuth of Fomalhaut at the given time and DR position? Think about GHA/Dec and your latitude/longitude. • Once you have the true azimuth, what steps convert that to a magnetic bearing using the given variation? • How does the difference between the magnetic bearing and the observed compass bearing relate to deviation (including its east or west sign)?

✅ Before You Answer

• Be sure you’re using the correct sign convention: East variation/deviation is usually added, West is subtracted ("East is least, West is best"—think carefully how this applies). • Confirm that you have adjusted the chronometer time correctly using the chronometer error before entering sight reduction tables or formulas. • After you compute deviation, double-check whether your result is east or west based on whether the compass is reading higher or lower than the magnetic bearing.

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