At 2048 ZT on 13 October you are in DR...

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Question 1 of 2066636eea28f7522a1c51ac82

At 2048 ZT on 13 October you are in DR position LAT 44° 02.8' S, LONG 146° 58.3' E, when you observe an amplitude of Venus. The planet is about one Sun's diameter above the visible horizon and bears 222.2° psc. The variation is 15° E. What is the deviation?

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🔍 Key Concepts

• Amplitude of a celestial body to find compass error • Relationship among true bearing, variation, deviation, and compass bearing • Using the planet’s true azimuth from sight reduction tables or almanac data to compare with the observed compass bearing

💭 Think About

• What sequence of steps converts a planet’s true azimuth into the expected magnetic bearing at your position and time? • Once you have the expected magnetic bearing, how do you compare it with the observed compass bearing to determine the sign and value of deviation? • How does an easterly variation affect the conversion between true and magnetic directions?

✅ Before You Answer

• Be sure you are using the correct sign convention: East is least, West is best when going between true and magnetic. • Confirm that you’re using the planet’s azimuth (true bearing) from the correct DR position, date, and time before any comparison. • When you get compass error, check whether a compass bearing larger than magnetic means deviation is west or east, using a consistent rule.

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