On 7 December your 0350 ZT position is LAT...

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Question 1 of 2066636eea28f7522a1c51ae40

On 7 December your 0350 ZT position is LAT 35°42'N, LONG 17°38'E. You observe Polaris bearing 359.7°pgc. At the time of the observation the helmsman noted that he was heading 016°pgc and 014°psc. The variation is 1°E. What is the deviation for that heading?

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Question 1 of 20

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🔍 Key Concepts

• Compass error = difference between true heading and compass heading • Relationship between true (T), magnetic (M), compass (C), variation (Var), and deviation (Dev) • Polaris gives an approximate true bearing very close to true north at this latitude and date

💭 Think About

• How can you use the observed compass bearing of Polaris and the fact that Polaris is nearly on true north to find the compass error? • Once you know the compass error on that heading, how do you separate the part due to variation from the part due to deviation? • Pay attention to whether the error you compute is east or west and how that sign carries through from true to compass.

✅ Before You Answer

• Write out the full T–M–C chain, including variation and deviation, with proper east/west signs. • Confirm whether the true bearing of Polaris at that time and position can be assumed as effectively 000°T for exam purposes. • Double‑check that the final deviation you get corresponds to the ship’s compass heading (psc) asked for, not the gyro heading (pgc).

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