On 5 February your 2320 ZT position is LAT...

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Question 1 of 2066636eea28f7522a1c51ae23

On 5 February your 2320 ZT position is LAT 52° 28' N, LONG 23° 48' W. You observe Polaris bearing 000.2° pgc. At the time of the observation the helmsman noted that he was heading 224° pgc and 244° psc. The variation is 20° W. What is the deviation for that heading?

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Question 1 of 20

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🔍 Key Concepts

• Compass error is the difference between true and compass directions • Relationship between psc (per standard compass), pgc (per gyro compass), variation, and deviation • Using the observed bearing of Polaris to find true north

💭 Think About

• How can you use the Polaris bearing and the ship’s heading to figure out the direction of compass error? • What is the correct order to apply variation and deviation when converting between compass and true? • Should the deviation on this heading be added east or west to make the compass agree with true?

✅ Before You Answer

• Write out the full conversion chain: True ↔ Gyro ↔ Magnetic ↔ Compass and label each step • Confirm whether the Polaris bearing you used is pgc (gyro) or psc (standard compass) before starting • After you compute the deviation, check if applying it to the compass heading gives a reasonable true heading near what you expect for this track.

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