🔍 Key Concepts

• quadrantal deviation and when it is greatest (cardinal vs intercardinal headings) • Difference between permanent magnet correctors and soft iron correctors • What each compass corrector (spheres, magnets, Flinders bar) is designed to fix

💭 Think About

• Ask yourself: On which headings (cardinal or intercardinal) is quadrantal deviation at its maximum, and which type of deviation do the soft iron correctors handle? • Compare which options are associated with permanent magnetism of the ship and which are associated with induced soft iron magnetism. • Think about what the Flinders bar is mainly used to correct (vertical soft iron / heeling error) and rule out any choices that only affect that type of error.

✅ Before You Answer

• Be clear on the definition of quadrantal deviation (shape of its curve and where its peaks occur). • Identify which device (from the choices) is specifically designed to correct quadrantal deviation on intercardinal headings. • Verify which options are permanent magnet correctors versus soft iron correctors before choosing.