What causes compass deviation?

Question 1 of 2707066636ee928f7522a1c519291

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Question 1 of 27070

Q

What causes compass deviation?

🔍 Key Concepts

• Compass deviation vs. variation – know the difference between these two errors • Magnetic influences near the compass (what can affect the compass on board a ship) • How a ship’s own magnetism can change with heading and cargo

💭 Think About

• Ask yourself: Which option describes an error caused by things ON the vessel, not outside in the earth? • Think about which answer would change if you moved the compass to a different location on the same vessel. • Consider: Which cause would vary with changes in the vessel’s heading, loading, or nearby steel structures?

✅ Before You Answer

• Verify that variation is related to the earth’s magnetic field, not to the ship itself. • Check which choice clearly refers to magnetism associated with the vessel or its equipment. • Eliminate options that describe mechanical issues (like alignment or dirt) rather than magnetic effects.