On 23 July your 2100 ZT position is LAT...

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Question 1 of 2066636eea28f7522a1c51ad57

On 23 July your 2100 ZT position is LAT 36°43.0'N, LONG 16°09.8'W, when you observed an azimuth of Polaris to determine the compass error. Polaris bears 359.0° per gyrocompass. At the time of the observation, the helmsman noted that he was heading 319.0° per gyrocompass and 331.0° per standard compass. Variation is 12.0°W. Which of the following statements is TRUE?

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Question 1 of 20

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🔍 Key Concepts

• Polaris azimuth and why Polaris is used to find true north and compass error • The relationship between True (T), Variation (Var), Magnetic (M), Deviation (Dev), and Compass (C) headings/ bearings • Difference between gyro error, deviation, and overall compass error

💭 Think About

• First, think about what the TRUE bearing of Polaris should be from your position and date, and compare that to the observed gyro bearing to find the gyro error. • Next, use the helmsman’s two headings (gyro and standard compass) to connect gyro heading, true heading, variation, deviation, and compass error in the proper order. • Finally, check which of the answer choices are talking about gyro error, which are about deviation, and which are about total compass error, and see which one matches your calculated sign and size.

✅ Before You Answer

• Be clear on your sign convention: does "east" error mean the indicated bearing is east or west of true? Keep it consistent. • Double‑check that you are not mixing up deviation (error of a specific magnetic compass) with gyro error (difference between gyro and true). • Confirm that your final statement (gyro error, deviation, or compass error) matches exactly what each choice is claiming, including whether it is E or W and the correct magnitude in degrees.

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