Deviation is associated with magnetic influences in the aircraft, whereas variation is the angle between true north and magnetic north.

### Why this is right The statement assigns each term to its correct source and reference pair. Aircraft magnetic influences can affect the compass and produce deviation; variation is the angular difference between true and magnetic north. ### The concept Both terms are angular corrections, but they describe different relationships. Variation is a true-to-magnetic reference difference. Deviation is a magnetic-to-compass difference associated with the aircraft. Because they represent different links, they are applied in sequence rather than treated as interchangeable errors. ### Terms - **Deviation**: The difference between magnetic north and compass north, affected by aircraft magnetic influences. - **Variation**: The angle between true north and magnetic north. ### Remember Variation is geographic reference conversion; deviation concerns the compass reference.