🔍 Key Concepts

• Magnetic compass adjustment sequence (soft iron correctors, permanent magnets, heeling magnet, quadrantal spheres) • Difference between variation (chart/earth-related) and deviation (ship/compass-related) • When and why a deviation table is actually created in the adjustment process

💭 Think About

• In what logical order would you remove or reduce compass errors: variation, deviation from ship’s magnetism, or local magnetic effects at different headings? • Think about whether you want all physical corrections in place before you measure the remaining deviation, or measure first and then install correctors. • Which of these answer choices describes a situation where your table would represent the final residual deviation the compass will actually have in service?

✅ Before You Answer

• Be clear on the definition: variation vs. deviation and which one is related to the ship and which to the earth’s field. • Consider that a deviation table should show the compass errors that remain after all practical adjustments are done, not before. • Check which options talk about actions done before vs after placing correctors and ask: would that give me a table that matches how the compass will behave at sea?