On 5 August your 0310 ZT position is LAT 09°...

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Question 1 of 2066636eea28f7522a1c51ae22

On 5 August your 0310 ZT position is LAT 09° 02' N, LONG 21° 08' W. You observe Polaris bearing 002° pgc. At the time of the observation the helmsman noted that he was heading 316° pgc and 329° psc. The variation is 15° W. What is the deviation for that heading?

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Question 1 of 20

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🔍 Key Concepts

• Relationship among psc (per ship’s compass), pgc (per gyro compass), magnetic, and true headings • How to apply variation and deviation in the correct order and with correct signs (East/West)** • Use of the standard compass conversion memory aid (e.g., "True Virgins Make Dull Company" or similar)

💭 Think About

• Start from the heading the helmsman is steering per ship’s compass (psc) and work step‑by‑step toward true or magnetic using the given information—what do you already know and what are you trying to solve for? • Compare the gyro heading (pgc) and ship’s compass heading (psc). How does the known variation help you connect these to the magnetic heading, and where in that chain does deviation belong? • Think about the sign convention: if variation is 15° W, in which direction does it shift magnetic from true? Then, in which direction must deviation shift compass from magnetic to match the observed compass reading?

✅ Before You Answer

• Write out the full conversion line: True – Variation = Magnetic – Deviation = Compass and make sure all arrows and signs (E/W) are consistent. • Double‑check that you are using the ship’s compass heading (psc), not the gyro heading (pgc), when solving for deviation. • After you compute deviation, verify whether the resulting value matches one of the choices in both magnitude and East/West sign.

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