🔍 Key Concepts

• Magnetic deviation and how it differs from variation • How the effect of a ship’s magnetism on the compass is expressed in standard compass correction formulas • The traditional names given to the individual terms in the deviation formula (often labeled A, B, C, D, E, etc.)

💭 Think About

• Think about math and physics: when you break a total effect into several directional or angular parts, what are those parts usually called in equations? • Recall how deviation is written as a function of the ship’s heading (for example, involving sine and cosine terms) — what is each multiplier of those functions called? • When reading a deviation table or doing a compass adjustment, what word is used for each of the labeled magnetic components A, B, C, etc.?

✅ Before You Answer

• Verify which option is commonly used in navigation texts to describe the A, B, C, D, E magnetic terms of deviation. • Eliminate any answer choices that are not standard mathematical/physical terminology for parts of an equation. • Be sure the term you pick is something you’ve actually seen associated with compass deviation in compass adjustment or magnetic deviation formula discussions.