🔍 Key Concepts

• Compass deviation vs. variation (understand the difference) • How a ship’s magnetic field interacts with the magnetic compass • Which factors on board change the ship’s magnetic influence as you alter course or motion

💭 Think About

• Ask yourself: Is deviation caused by something on the ship or outside the ship? • Which of the options will change how the ship’s own magnetism lines up with the Earth’s magnetic field? • Think about when the deviation card/table is made—what variable is listed across the top or side of the table?

✅ Before You Answer

• Recall that variation is related to geographic location and Earth’s magnetic field, not the ship itself. • Look at a sample deviation card from your study materials: what is the main column labeled with? • Eliminate any answers that mainly affect environmental magnetism rather than the ship’s induced magnetism in different directions.