On 20 June your vessel's 1955 ZT DR position...

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Question 1 of 2066636eea28f7522a1c51ac41

On 20 June your vessel's 1955 ZT DR position is LAT 52° 38.9' N, LONG 03° 42.7' E, when an amplitude of the Sun is observed. The Sun's center is on the visible horizon and bears 311° per gyrocompass. Variation in the area is 6° W. At the time of the observation, the helmsman noted that he was heading 352° per gyrocompass and 358° per steering compass. What is the gyro error and deviation for that heading?

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Question 1 of 20

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🔍 Key Concepts

• Amplitude of the Sun to find magnetic error (or variation + deviation relationship) • Relationship between true bearing, magnetic bearing, compass bearing, and gyro bearing • Using the helmsman’s noted headings to separate gyro error (GE) from deviation (DEV)

💭 Think About

• From an amplitude of the Sun, what are you actually finding: an error of which reference (true vs magnetic vs gyro)? • How do you move step‑by‑step between true, magnetic, compass, and gyro headings using signs for variation and deviation? • Once you know the true or magnetic value that corresponds to the Sun’s observed bearing, how can you compare that with the gyro bearing to determine gyro error, and then use the steering‑compass heading to back out deviation?

✅ Before You Answer

• Be clear on the sign convention: is variation west added or subtracted when going from true to magnetic? Same for deviation. • Confirm whether the amplitude gives you information about magnetic error or gyro error directly, and then how that connects to the gyro bearing 311°. • Use the two headings the helmsman recorded (352° gyro, 358° steering compass) to isolate: first the gyro error, then the deviation on that compass heading.

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