At 2043 ZT on 13 October you are in DR...

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Question 1 of 2066636eea28f7522a1c51ac7e

At 2043 ZT on 13 October you are in DR position LAT 43°57.3' S, LONG 147°16.0' E, when you observe an amplitude of Venus. The planet is about one Sun's diameter above the horizon and bears 236.2°pgc. The variation is 15°E. What is the gyro error?

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Question 1 of 20

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🔍 Key Concepts

• Amplitude of a celestial body and how it relates to true bearing at rising/setting • Relationship between true bearing, magnetic bearing, variation, and gyro bearing • Sign convention for gyro error East or West (Gyro least, error East / Gyro best, error West)

💭 Think About

• From the DR position, date, and time, think about where Venus should be azimuth-wise when it is just above the horizon – what would its true bearing be? • Compare the true bearing you determine with the observed gyro bearing (236.2°pgc) after correcting for variation to get the magnetic/true bearing. • Decide whether the gyro is reading too high or too low compared to true, and from that determine whether the error is East or West and by how many degrees.

✅ Before You Answer

• Be sure you understand whether you are working in true, magnetic, or gyro at each step. • Double‑check how you apply variation 15°E – does it get added or subtracted when going between true and magnetic? • Confirm the rule: if the gyro reading is less than true, the error is East; if the gyro reading is greater than true, the error is West.

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