At 1610 ZT on 14 August, in DR position LAT...

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Question 1 of 2066636eea28f7522a1c51ab2b

At 1610 ZT on 14 August, in DR position LAT 33° 24.6' S, LONG 028° 15.4' W, you observe an amplitude of the Moon. The center of the Moon is on the visible horizon and bears 111.0° psc. The variation is 2° E. What is the deviation?

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Question 1 of 20

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🔍 Key Concepts

• Amplitude of the Moon and how it relates to true bearing of the point of rising/setting • Relationship between true bearing, variation, deviation, and compass bearing • Correcting from true to compass (and back): the TVMDC sequence

💭 Think About

• From the DR latitude and date, think about whether the Moon’s rising amplitude should be north or south of East, and by about how many degrees • Compare the computed true bearing of the Moon on the horizon with the observed compass bearing 111.0° psc and consider the sign of the total compass error • Once you know total compass error and you are given variation 2° E, think carefully: does that make deviation east or west, and by what magnitude?

✅ Before You Answer

• Be sure you are using the correct amplitude formula for a body on the eastern horizon and entering the table with the right latitude and declination sign • Confirm whether your final compass error (CE) is east or west by checking if the compass bearing is greater or less than the true bearing • When you split CE into variation + deviation, double-check that an easterly variation makes the magnetic north east of true north and how that affects the sign of deviation

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